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Fernandez JR, Sherchan JS, Cho YJ, Nanaw J, Joseph NT, Forde AT. College students' underlying perceptions of COVID-19 threat, healthcare discrimination, and healthcare system inequities associated with self-rated health across racial/ethnic groups in the U.S. Front Public Health 2023; 10:1028344. [PMID: 36684993 PMCID: PMC9853174 DOI: 10.3389/fpubh.2022.1028344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Accepted: 11/23/2022] [Indexed: 01/09/2023] Open
Abstract
Background COVID-19-related health perceptions may differentially impact college students' stress, and in turn, their mental and physical health. This study examined racial/ethnic differences in college students' underlying perceptions of COVID-19 threat, healthcare discrimination, and U.S. healthcare system inequities and their associations with self-rated mental and physical health. Methods Four-hundred-thirty-two university students completed an online survey (December 2020-December 2021). Latent class analyses identified classes of perceived COVID-19 threat (i.e., severity, susceptibility), healthcare discrimination, and U.S. healthcare system inequities. Regression analyses examined whether class membership varied by race/ethnicity and was associated with self-rated mental and physical health. Results Class 1 members (27.3% of the sample) were more likely to identify as Hispanic or Latino, Non-Hispanic Asian, Non-Hispanic Black or African American, and Non-Hispanic Multiracial vs. Non-Hispanic White (vs. Class 4). Class 1 had high perceived COVID-19 threat, medium perceived healthcare discrimination, and high perceived U.S. healthcare system inequities, as well as higher odds of poorer mental and physical health (vs. Class 4). Conclusions College students' underlying perceptions of COVID-19 threat, healthcare discrimination, and U.S. healthcare system inequities were associated with poorer health. Given that students with these perceptions were more likely to belong to minoritized racial/ethnic groups, concerns over COVID-19 risk and healthcare may partially explain racial/ethnic disparities in college students' health. This study contributes to a limited body of evidence on college students' perceptions of the U.S. healthcare system and suggests important ways that structural inequalities and racial/ethnic disparities in COVID-19 risk, healthcare discrimination, and concerns over U.S. healthcare system inequity may affect college students' health.
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Affiliation(s)
- Jessica R. Fernandez
- Division of Intramural Research, National Institute on Minority Health and Health Disparities, National Institutes of Health, Bethesda, MD, United States
| | - Juliana S. Sherchan
- Division of Intramural Research, National Institute on Minority Health and Health Disparities, National Institutes of Health, Bethesda, MD, United States
- Department of Psychology, University of Maryland, College Park, MD, United States
| | - Yong Ju Cho
- Division of Intramural Research, National Institute on Minority Health and Health Disparities, National Institutes of Health, Bethesda, MD, United States
| | - Judy Nanaw
- Division of Intramural Research, National Institute on Minority Health and Health Disparities, National Institutes of Health, Bethesda, MD, United States
| | - Nataria T. Joseph
- Division of Social Science, Seaver College, Pepperdine University, Malibu, CA, United States
| | - Allana T. Forde
- Division of Intramural Research, National Institute on Minority Health and Health Disparities, National Institutes of Health, Bethesda, MD, United States
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Jang Y, Cho YJ, Park NS, Chiriboga DA, Hong S, Kim MT. Perceived racial discrimination and mental distress in older Korean Americans: the moderating role of ethnic resources. Ethn Health 2023; 28:1-11. [PMID: 34971333 PMCID: PMC9243182 DOI: 10.1080/13557858.2021.2022105] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Accepted: 12/16/2021] [Indexed: 06/14/2023]
Abstract
OBJECTIVES To examine associations among perceived racial discrimination, ethnic resources, and mental distress in older Korean Americans. Ethnic resources included ethnic identity (how closely individuals identify themselves with other members of the same ethnic background) and sense of community (individuals' feelings of belonging to their ethnic group). We examined the direct effect of perceived racial discrimination and these ethnic resources, as well as their interactions, hypothesizing that mental distress associated with perceived racial discrimination would be reduced by ethnic resources. DESIGN Using survey data from the Study of Older Korean Americans (N = 2,150), linear regression models of mental distress were examined for direct and interactive roles of perceived racial discrimination and ethnic resources. RESULTS Mental distress was directly associated with perceived racial discrimination (B = 1.90, SE = .20, p < .001), ethnic identity (B = -.41, SE = .13, p < .01), and sense of community (B = -.45, SE = .12, p < .001). Perceived racial discrimination interacted significantly with sense of community (B = -1.86, SE = .28, p < .001). Subgroup analyses suggested that in the context of experiencing racial discrimination, a high sense of community can serve as a buffer against mental distress. CONCLUSIONS Ethnic resources are a benefit in coping with experiences of discrimination. The moderating role of sense of community suggests the value of fostering social capital in ethnic communities to protect and promote older immigrants' mental health.
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Affiliation(s)
- Yuri Jang
- Edward R. Roybal Institute on Aging, Suzanne Dworak-Peck School of Social Work, University of Southern California
| | - Yong Ju Cho
- Edward R. Roybal Institute on Aging, Suzanne Dworak-Peck School of Social Work, University of Southern California
| | | | | | - Seunghye Hong
- Thompson School of Social Work & Public Health, University of Hawai’i at Mānoa
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Jeon KH, Kwon JM, Lee MS, Cho YJ, Oh IY, Lee JH. Deep learning-based electrocardiogram analysis detecting paroxysmal atrial fibrillation during sinus rhythm in patients with cryptogenic stroke: validation study using implantable cardiac monitoring. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.2777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Abstract
Background
Atrial fibrillation (AF) is the most cause of cardioembolic source causing cryptogenic stroke. In these, anticoagulation therapy could reduce recurrence of stroke. However, paroxysmal AF would not be detected even by 24 hours Holter monitoring. Deep learning-based electrocardiogram (ECG) analysis models were recently developed to detect AF during sinus rhythm.
Purpose
We aimed to develop a deep learning algorithm (DLA) to detect AF during sinus rhythm and validate the model in patients with cryptogenic stroke who underwent implantable cardiac monitoring (ICM) to diagnose paroxysmal AF.
Methods
This cohort study involved three hospitals (A, B, and C). We developed a DLA to detect AF using sinus rhythm 10 s 12-lead ECG. We included adult patients aged ≥18 years from hospital A and B. We used development data from AF adult patients who had at least one atrial fibrillation rhythm in the study period (Jan 2016 to Dec 2021) and non-AF patients who had no reference to AF in the ECG and electronic medical record. DLA was based on convolutional neural network (CNN) using 10 s 12-lead. For external validation, the ECGs from 217 patients (hospital C) with cryptogenic stroke who underwent ICM were analyzed by using the DLA for validating the accuracy in the real-world clinical situations.
Results
We included 10,605 AF adult patients and 50,522 non-AF patients as development data. During the internal validation, the area under the curve (AUC) of the final DLA based on CNN was 0.793 (95% Confidence interval 0.778–0.807). In external validation data from cryptogenic stroke patients, the mean ICM duration was 15.1 months, and AF >5 mins was detected in 32 patients (14.5%). The diagnostic accuracy of DLA was 0.793 to detect AF during sinus rhythm, and AUC was 0.824. The sensitivity, specificity, positive predictive value, and negative predictive value of the model were 0.844, 0.784, 0.403, and 0.967, respectively, which outperformed other conventional predictive methods based on clinical factors, such as CHARGE-AF, C2hest, and HATCH.
Conclusions
In this study, DLA accurately detected paroxysmal AF using 12-leads normal sinus rhythm ECG in patients with cryptogenic stroke and outperformed the conventional models. The DLA could be used as a screening tool to identify the cause of stroke in the future.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- K H Jeon
- Seoul National University Bundang Hospital , Seongnam , Korea (Republic of)
| | - J M Kwon
- Incheon Sejong Hospital, Department of Critical Care and Emergency Medicine , Incheon , Korea (Republic of)
| | - M S Lee
- Medical research team, Medical AI Inc , San Francisco , United States of America
| | - Y J Cho
- Seoul National University Bundang Hospital , Seongnam , Korea (Republic of)
| | - I Y Oh
- Seoul National University Bundang Hospital , Seongnam , Korea (Republic of)
| | - J H Lee
- Seoul National University Bundang Hospital , Seongnam , Korea (Republic of)
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Jang Y, Park J, Choi EY, Cho YJ, Park NS, Chiriboga DA. Social isolation in Asian Americans: risks associated with socio-demographic, health, and immigration factors. Ethn Health 2022; 27:1428-1441. [PMID: 33550840 DOI: 10.1080/13557858.2021.1881765] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2020] [Accepted: 01/21/2021] [Indexed: 06/12/2023]
Abstract
OBJECTIVES The present study examined the factors associated with social isolation in Asian Americans. Three types of social isolation (social isolation from family, social isolation from friends, and overall social isolation), identified by the Lubben Social Network Scale-6, were examined with a sample of Asian Americans representing diverse ethnic groups (Chinese, Asian Indian, Korean, Vietnamese, Filipino, and other Asians) and a broad age range (18-98). DESIGN Using data from the 2015 Asian American Quality of Life Survey (N = 2609), logistic regression models examined how each type of social isolation was predicted by sociodemographic (age, gender, ethnic origin, marital status, education, and perceived financial status), health-related (chronic medical conditions and self-rated health), and immigration-related (proportion of life in the United States and English proficiency) variables. RESULTS The percentage of the sample that fell into the category of social isolation from family, social isolation from friends, and overall isolation ranged from 18.2% to 19.3%. At 36% in the friend category and 33% in the overall category, the Vietnamese sample showed a heightened risk of social isolation. Regression analyses indicated that, for both family and friend categories, individuals who were in the middle-aged group (40-59 years old) and who had limited English proficiency demonstrated higher odds of being isolated. Reflecting relational differences in family and friend networks, the risk associated with unmarried status was specific to social isolation from family, whereas having unmet financial needs was only associated with social isolation from friends. CONCLUSIONS The study findings expand our understanding of the multiple domains of social isolation in an understudied population and emphasize the importance of developing prevention and intervention programs to foster social connectedness among Asian Americans. Our findings on risk factors and ethnic variations help identify the groups to be prioritized in intervention efforts and suggest ways to approach them.
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Affiliation(s)
- Yuri Jang
- Edward R. Roybal Institute on Aging, Suzanne Dworak-Peck School of Social Work, University of Southern California, Los Angeles, CA, USA
| | - Juyoung Park
- Edward R. Roybal Institute on Aging, Suzanne Dworak-Peck School of Social Work, University of Southern California, Los Angeles, CA, USA
| | - Eun Young Choi
- Leonard Davis School of Gerontology, University of Southern California, Los Angeles, CA, USA
| | - Yong Ju Cho
- Edward R. Roybal Institute on Aging, Suzanne Dworak-Peck School of Social Work, University of Southern California, Los Angeles, CA, USA
| | - Nan Sook Park
- School of Social Work, University of South Florida, Tampa, FL, USA
| | - David A Chiriboga
- Department of Child and Family Studies, University of South Florida, Tampa, FL, USA
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Nguyen T, Cho YJ, Jang Y. Perceived discrimination, psychosocial resources, and mental distress in Vietnamese Americans. J Migr Health 2021; 3:100039. [PMID: 34405187 PMCID: PMC8352156 DOI: 10.1016/j.jmh.2021.100039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Revised: 12/03/2020] [Accepted: 03/31/2021] [Indexed: 11/23/2022] Open
Abstract
This study examines how the mental health of Vietnamese Americans is influenced by a life stressor (perceived discrimination) and psychosocial resources (social network, religiosity, and acculturation). Data came from 513 Vietnamese Americans who were subsample of the Asian American Quality of Life (AAQoL) survey (total N = 2,614). The AAQoL survey was conducted with self-identified Asian Americans aged 18 or older in Central Texas in 2015. More than 32% of the Vietnamese sample reported perceived discrimination. A higher level of mental distress was associated with younger age, unmarried status, unmet financial status, poorer ratings of health, fewer years of stay in the U.S., perceived discrimination, smaller social network, and lower levels of acculturation and religiosity. In a multivariate analysis, the experience of discrimination (β = 0.16, p < .01), smaller social network (β = −.10, p < .05), and lower acculturation (β = −.17, p < .05) were found to be significant predictors to mental distress. No significant interaction was found. These identified risks and resources should be addressed in developing and implementing culturally sensitive mental health interventions targeted to Vietnamese American communities.
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Affiliation(s)
- Trang Nguyen
- Center for Studies of Displaced Populations, School of Public Health and Tropical Medicine, Tulane University, United States.,Department of Social Work, University of Social Sciences and Humanities, Vietnam National University, Hanoi, Vietnam
| | - Yong Ju Cho
- Edward R. Roybal Institute on Aging, Suzanne Dworak-Peck School of Social Work, University of Southern California, 669 West 34th Street, Los Angeles, CA 90089-0411, United States
| | - Yuri Jang
- Edward R. Roybal Institute on Aging, Suzanne Dworak-Peck School of Social Work, University of Southern California, 669 West 34th Street, Los Angeles, CA 90089-0411, United States
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Jang Y, Chiriboga DA, Park NS, Yoon H, Cho YJ, Hong S, Nam S, Rhee MK, Bernstein KS, Kim MT. The role of self-rated mental health in seeking professional mental health services among older Korean immigrants. Aging Ment Health 2021; 25:1332-1337. [PMID: 32349527 PMCID: PMC7606462 DOI: 10.1080/13607863.2020.1758908] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
OBJECTIVES The gap between mental health needs and service use in racial/ethnic minorities continues to be a major public health concern. Focusing on older Korean immigrants, the present study examined linkages among mental distress, self-rated mental health (SRMH), and the use of professional mental health services. We hypothesized that SRMH would play a mediating role in the relationship between mental distress and the use of professional mental health services. METHOD Using data from the Study of Older Korean Americans (SOKA; N = 2,150, Mean age = 73.4), the direct and indirect effect models were tested. RESULTS Nearly 30% of the sample fell within the category of experiencing mental distress, but only a small proportion (5.7%) had used professional mental health services. Supporting our hypothesis, the pathway from mental distress to the use of professional mental health services was influenced by an individual's subjective perception of mental health status: the indirect effect of mental distress on service use through SRMH (.04 [.01]) was significant (bias-corrected 95% confidence interval for the indirect effect = .02, .06). CONCLUSION The findings of this study not only contribute to our understanding of help-seeking processes in a group at high mental health risk but also suggest avenues to promote their use of mental health services.
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Affiliation(s)
- Yuri Jang
- Edward R. Roybal Institute on Aging, Suzanne Dworak-Peck School of Social Work, University of Southern California, Los Angeles, CA, USA,Corresponding Author: Yuri Jang, Ph.D., Edward R. Roybal Institute on Aging, Suzanne Dworak-Peck School of Social Work, University of Southern California, 669 West 34th Street, Los Angeles, CA 90089; Telephone number: 213-821-6441;
| | - David A. Chiriboga
- Department of Child and Family Studies, University of South Florida, Tampa, FL, USA
| | - Nan Sook Park
- School of Social Work, University of South Florida, Tampa, FL, USA
| | - Hyunwoo Yoon
- School of Social Work, Texas State University, San Marcos, TX, USA
| | - Yong Ju Cho
- Edward R. Roybal Institute on Aging, Suzanne Dworak-Peck School of Social Work, University of Southern California, Los Angeles, CA, USA
| | - Seunghye Hong
- Myron B. Thompson School of Social Work, University of Hawai‘i at Mānoa, Hawai‘i, USA
| | - Sanggon Nam
- Department of Public Health, School of Nursing, Azusa Pacific University, Azusa, CA, USA
| | - Min-Kyoung Rhee
- Leonard Davis School of Gerontology, University of Southern California, Los Angeles, CA, USA
| | - Kunsook S. Bernstein
- Hunter-Bellevue School of Nursing, City University of New York, New York, NY, USA
| | - Miyong T. Kim
- School of Nursing, University of Texas at Austin, TX, USA
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Kwon HH, Yang SH, Cho YJ, Shin E, Choi M, Bae Y, Jung JY, Park GH. Comparison of a 1064-nm neodymium-doped yttrium aluminum garnet picosecond laser using a diffractive optical element vs. a nonablative 1550-nm erbium-glass laser for the treatment of facial acne scarring in Asian patients: a 17-week prospective, randomized, split-face, controlled trial. J Eur Acad Dermatol Venereol 2020; 34:2907-2913. [PMID: 32603006 DOI: 10.1111/jdv.16643] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Accepted: 05/05/2020] [Indexed: 02/06/2023]
Abstract
BACKGROUND Novel picosecond lasers using a diffractive optical element (P-DOE) have been available for skin resurfacing with distinct mechanisms. However, there are limited data directly comparing P-DOE and conventional fractional lasers for the treatment of atrophic acne scarring. OBJECTIVES We sought to compare the efficacy and safety of a 1064-nm neodymium-doped yttrium aluminium garnet P-DOE and a non-ablative fractional laser (NAFL) in the treatment of acne scarring. METHODS A prospective, randomized, split-face, controlled trial was performed. One randomly assigned half-side of each patient's face (n = 25) was treated with four consecutive sessions of P-DOE at 3-week intervals and the other side with NAFL, with subsequent follow-up for 8 weeks after the final sessions. The efficacy and safety of the two lasers were determined by the Echelle d'Evaluation Clinique des Cicatrices d'acné (Scale of Clinical Evaluation of Acne Scars; ECCA) grading scale, Investigator's Global Assessment (IGA) score and patients' reports at the final visit. Histologic analysis was also performed. RESULTS The P-DOE-treated side achieved a significantly better improvement in acne appearance (ECCA per cent reduction: 55% vs. 42%) with less severe pain (4.3 vs. 5.6) (P < 0.05). The IGA score and subjective satisfaction were consistent with ECCA score results. Occurrences of treatment-related side-effects were also lower in the group treated with P-DOE (P < 0.05). Histologic analysis revealed elongation and increased density of neocollagen fibres, elastic fibres and mucin throughout the dermis from both sides. CONCLUSIONS Compared with NAFL, P-DOE afforded better clinical outcomes and fewer side-effects in the treatment of acne scarring in Asian patients.
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Affiliation(s)
- H H Kwon
- Oaro Dermatology Clinic, Seoul, Korea
| | - S H Yang
- Department of Dermatology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Y J Cho
- Oaro Dermatology Clinic, Seoul, Korea
| | - E Shin
- Department of Pathology, Dongtan Sacred Heart Hospital, Hallym University College of Medicine, Hwaseong, Korea
| | - M Choi
- Department of Dermatology, Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Korea
| | - Y Bae
- Department of Dermatology, Dongtan Sacred Heart Hospital, Hallym University College of Medicine, Hwaseong, Korea
| | - J Y Jung
- Oaro Dermatology Clinic, Seoul, Korea
| | - G-H Park
- Department of Dermatology, Dongtan Sacred Heart Hospital, Hallym University College of Medicine, Hwaseong, Korea
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Cho YJ, Jang Y, Ko JE, Lee SH, Moon SK. Perceived discrimination and depressive symptoms: a study of Vietnamese women who migrated to South Korea due to marriage. Women Health 2020; 60:863-871. [PMID: 32498617 DOI: 10.1080/03630242.2020.1766640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
International migrants are one group that is vulnerable to discrimination and mental health problems. This study examined the experience of perceived discrimination and its impact on depressive symptoms among women who migrated in the specific context of marriage. Using social constructionism and the stress appraisal model, this study conceptualized perceived discrimination as a potential source of stress and hypothesized that it would negatively impact the mental health of migrant women. A survey sample of 212 Vietnamese marriage migrant women in South Korea was used for the final analysis. Perceived discrimination was measured using the adapted Everyday Discrimination Scale (EDS). Overall, approximately 62% of the sample reported having at least one discriminatory encounter based on the nine items of the EDS. The results of the multivariate analyses indicated that perceived discrimination posed a significant risk to mental health (β = 0.43, p < .001). The experience of perceived discrimination increased the amount of explained variance of depressive symptoms by 17%. Findings highlighted the adverse mental health consequences of daily unfair treatment and disrespect in interpersonal contexts and the importance of social policies and programs that promote respect for cultural diversity.
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Affiliation(s)
- Yong Ju Cho
- Suzanne Dworak-Peck School of Social Work, University of Southern California , LosAngeles, California, USA
| | - Yuri Jang
- Suzanne Dworak-Peck School of Social Work, University of Southern California , LosAngeles, California, USA
| | - Jung Eun Ko
- Department of Counseling, Kyung Hee Cyber University , Seoul, South Korea
| | - Sun Hae Lee
- Department of Social Welfare, Chung-Ang University , Seoul, South Korea
| | - Soo Kyung Moon
- Department of Social Welfare, Daejin University , Pocheon, South Korea
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Jang Y, Park NS, Rhee MK, Yoon H, Cho YJ, Kim MT, Chiriboga DA. PHYSICAL-MENTAL-ORAL-COGNITIVE HEALTH IN OLDER KOREAN AMERICANS: A MULTISITE STUDY. Innov Aging 2019. [PMCID: PMC6840713 DOI: 10.1093/geroni/igz038.1510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Using data from surveys with older Korean Americans (n = 2,150) conducted at five sites in the U.S. (California, New York, Texas, Hawaii, and Florida), the present study explored the status of physical/mental/oral/cognitive health and its determinants. For each health domain, we examined how self-rating (excellent/very good/good/fair/poor) of health was associated with other domain-relevant indicators (e.g., the number of chronic diseases, symptoms of depression, problems with teeth or gums, or cognitive performance) and sociocultural factors (e.g., socioeconomic status, acculturation, social network, and social cohesion). Geographic variation was also considered. The correlations between self-ratings and domain-relevant indicators in all health domains were significant but moderate. A series of multivariate regression models of self-ratings of physical/mental/oral/cognitive health not only confirmed the effect of the domain-relevant health indicators but also demonstrated a critical contribution of sociocultural determinants. Implications for older immigrants were discussed in terms of place, culture, and context.
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Affiliation(s)
- Yuri Jang
- University of Southern California, Los Angeles, California, United States
| | - Nan Sook Park
- University of South Florida, Tampa, Florida, United States
| | - Min-Kyoung Rhee
- University of Southern California, Los Angeles, California, United States
| | - Hyunwoo Yoon
- Texas State University, san Marcos, Texas, United States
| | - Yong Ju Cho
- University of Texas at Austin, Austin, Texas, United States
| | - miyong T Kim
- University of Texas at Austin, Austin, Texas, United States
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Lee SH, Bae JW, Han M, Cho YJ, Park JW, Oh SR, Kim SJ, Choe SY, Yun JH, Lee Y. 2794 Nerve Sparing Radical Hysterectomy Versus Conventional Radical Hysterectomy in Early-Stage Cervical Cancer: A Systematic Review And Meta-Analysis. J Minim Invasive Gynecol 2019. [DOI: 10.1016/j.jmig.2019.09.477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Lee S, Park JB, Cho YJ, Ryu HG, Jang EJ. P3429A novel prediction model for mortality after cardiac surgery using institutional case volume. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz745.0303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Purpose
A number of risk prediction models have been developed to identify short term mortality after cardiovascular surgery. Most models include patient characteristics, laboratory data, and type of surgery, but no consideration for the amount of surgical experience. With numerous reports on the impact of case volume on patient outcome after high risk procedures, we attempted to develop a risk prediction models for in-hospital and 1-year mortality that takes institutional case volume into account.
Methods
We identified adult patients who underwent cardiac surgery from January 2008 to December 2017 from the National Health Insurance Service (NHIS) database by searching for patients with procedure codes of coronary artery bypass grafting, valve surgery, and surgery on thoracic aorta during the hospitalization. Study subjects were randomly assigned to either the derivation cohort or the validation cohort. In-hospital mortality and 1-year mortality data were collected using the NHIS database. Risk prediction models were developed from the derivation cohort using Cox proportional hazards regression. The prediction performances of models were evaluated in the validation cohort.
Results
The models developed in this study demonstrated fair discrimination for derivation cohort (N=22,004, c-statistics, 0.75 for in-hospital mortality; 0.73 for 1-year mortality) and acceptable calibration in the validation cohort. (N=22,003, Hosmer-Lemeshow χ2-test, P=0.08 and 0.16, respectively). Case volume was the key factor of mortality prediction models after cardiac surgery. (50≤ x <100 case per year. 100≤ x <200 case per year, ≥200 case per year are correlated with OR 3.29, 2.49, 1.85 in in-hospital mortality, 2.76, 1.99, 1.69 in 1-year mortality respectively, P value <0.001.)
Annual case volume as risk factor Variables In-hospital mortality 1-year mortality OR (95% CI) p-value OR (95% CI) p-value Annual case-volume (reference: ≥200) – – 100–200 1.69 (1.48, 1.93) <0.001 1.85 (1.58, 2.18) <0.001 50–100 1.99 (1.75, 2.25) <0.001 2.49 (2.15, 2.89) <0.001 <50 2.76 (2.44, 3.11) <0.001 3.29 (2.85, 3.79) <0.001 OR: Odds ratio; CI: confidence interval; Ref: Reference.
Discrimination and calibration
Conclusion
We developed and validated new risk prediction models for in-hospital and 1-year mortality after cardiac surgery using the NHIS database. These models may provide useful guides to predict mortality risks of patients with basic information and without laboratory findings.
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Affiliation(s)
- S Lee
- Seoul National University Hospital, Seoul, Korea (Republic of)
| | - J B Park
- Seoul National University Hospital, Seoul, Korea (Republic of)
| | - Y J Cho
- Seoul National University Hospital, Seoul, Korea (Republic of)
| | - H G Ryu
- Seoul National University Hospital, Seoul, Korea (Republic of)
| | - E J Jang
- Andong National University, Department of Information Statistics, Andong, Korea (Republic of)
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Abstract
This study explores factors associated with willingness to use a nursing home in Asian Americans. Focus is given to demographic variables (age, gender, ethnicity, marital status, and education), health-related variables (chronic medical condition and self-rated health), immigration-related variables (time in the U.S. and acculturation), and family-related variables (family network and family solidarity). Cross-sectional study. Data were drawn from 2551 participants in the 2015 Asian American Quality of Life Survey (aged 18-98). Participants were asked to indicate whether they would be willing to use a nursing home in the future. An affirmative response indicated a personal willingness to use a nursing home. Approximately 38% of the sample demonstrated willingness to use a nursing home. Higher odds for willingness were observed among those with advanced age, female gender, Korean ethnicity (compared with Chinese), better education, presence of a chronic medical condition, longer years of residence in the U.S., and lower levels of family solidarity. Reflecting the current trend of an increase in racial/ethnic minorities in nursing homes, a substantial proportion of the present sample of Asian Americans demonstrated willingness to use a nursing home. Findings on the factors associated with willingness provide implications for policies and services to respond to the long-term care needs of this emerging population.
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Affiliation(s)
- Yuri Jang
- Suzanne Dworak-Peck School of Social Work, University of Southern California, Los Angeles, CA, 90015, USA.
| | - Min-Kyoung Rhee
- Suzanne Dworak-Peck School of Social Work, University of Southern California, Los Angeles, CA, 90015, USA
| | - Yong Ju Cho
- Steve Hicks School of Social Work, The University of Texas at Austin, Austin, TX, USA
| | - Miyong T Kim
- School of Nursing, The University of Texas at Austin, Austin, TX, USA
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Iv M, Zhou M, Shpanskaya K, Perreault S, Wang Z, Tranvinh E, Lanzman B, Vajapeyam S, Vitanza NA, Fisher PG, Cho YJ, Laughlin S, Ramaswamy V, Taylor MD, Cheshier SH, Grant GA, Young Poussaint T, Gevaert O, Yeom KW. MR Imaging-Based Radiomic Signatures of Distinct Molecular Subgroups of Medulloblastoma. AJNR Am J Neuroradiol 2018; 40:154-161. [PMID: 30523141 DOI: 10.3174/ajnr.a5899] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Accepted: 10/06/2018] [Indexed: 12/12/2022]
Abstract
BACKGROUND AND PURPOSE Distinct molecular subgroups of pediatric medulloblastoma confer important differences in prognosis and therapy. Currently, tissue sampling is the only method to obtain information for classification. Our goal was to develop and validate radiomic and machine learning approaches for predicting molecular subgroups of pediatric medulloblastoma. MATERIALS AND METHODS In this multi-institutional retrospective study, we evaluated MR imaging datasets of 109 pediatric patients with medulloblastoma from 3 children's hospitals from January 2001 to January 2014. A computational framework was developed to extract MR imaging-based radiomic features from tumor segmentations, and we tested 2 predictive models: a double 10-fold cross-validation using a combined dataset consisting of all 3 patient cohorts and a 3-dataset cross-validation, in which training was performed on 2 cohorts and testing was performed on the third independent cohort. We used the Wilcoxon rank sum test for feature selection with assessment of area under the receiver operating characteristic curve to evaluate model performance. RESULTS Of 590 MR imaging-derived radiomic features, including intensity-based histograms, tumor edge-sharpness, Gabor features, and local area integral invariant features, extracted from imaging-derived tumor segmentations, tumor edge-sharpness was most useful for predicting sonic hedgehog and group 4 tumors. Receiver operating characteristic analysis revealed superior performance of the double 10-fold cross-validation model for predicting sonic hedgehog, group 3, and group 4 tumors when using combined T1- and T2-weighted images (area under the curve = 0.79, 0.70, and 0.83, respectively). With the independent 3-dataset cross-validation strategy, select radiomic features were predictive of sonic hedgehog (area under the curve = 0.70-0.73) and group 4 (area under the curve = 0.76-0.80) medulloblastoma. CONCLUSIONS This study provides proof-of-concept results for the application of radiomic and machine learning approaches to a multi-institutional dataset for the prediction of medulloblastoma subgroups.
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Affiliation(s)
- M Iv
- From the Department of Radiology (M.I., M.Z., K.S., E.T., B.L., K.W.Y.)
| | - M Zhou
- From the Department of Radiology (M.I., M.Z., K.S., E.T., B.L., K.W.Y.).,Stanford Center for Biomedical Informatics (M.Z., O.G., Z.W.)
| | - K Shpanskaya
- From the Department of Radiology (M.I., M.Z., K.S., E.T., B.L., K.W.Y.)
| | - S Perreault
- Department of Pediatrics (S.P.), Pediatric Neurology, Centre Hospitalier Universitaire Sainte Justine, University of Montréal, Montreal, Quebec, Canada
| | - Z Wang
- Stanford Center for Biomedical Informatics (M.Z., O.G., Z.W.)
| | - E Tranvinh
- From the Department of Radiology (M.I., M.Z., K.S., E.T., B.L., K.W.Y.)
| | - B Lanzman
- From the Department of Radiology (M.I., M.Z., K.S., E.T., B.L., K.W.Y.)
| | - S Vajapeyam
- Department of Radiology (S.V., T.Y.P.), Boston Children's Hospital, Harvard University, Boston, Massachusetts
| | - N A Vitanza
- Department Pediatrics Hematology-Oncology (N.A.V.), Seattle Children's Hospital, University of Washington, Seattle, Washington
| | - P G Fisher
- Department of Pediatrics (P.G.F.), Pediatric Neurology
| | - Y J Cho
- Department of Pediatrics (Y.J.C.), Pediatric Neurology, Oregon Health & Science University, Portland, Oregon
| | - S Laughlin
- Departments of Radiology, Neuro-Oncology, and Neurosurgery (S.L., V.R., M.D.T.), Hospital for Sick Children, Toronto, Ontario, Canada
| | - V Ramaswamy
- Departments of Radiology, Neuro-Oncology, and Neurosurgery (S.L., V.R., M.D.T.), Hospital for Sick Children, Toronto, Ontario, Canada
| | - M D Taylor
- Departments of Radiology, Neuro-Oncology, and Neurosurgery (S.L., V.R., M.D.T.), Hospital for Sick Children, Toronto, Ontario, Canada
| | - S H Cheshier
- Department of Neurosurgery (S.H.C.), Pediatric Neurosurgery, University of Utah, Salt Lake City, Utah
| | - G A Grant
- Department of Neurosurgery (G.A.G.), Pediatric Neurosurgery, Lucile Packard Children's Hospital, Stanford University, Palo Alto, California
| | - T Young Poussaint
- Department of Radiology (S.V., T.Y.P.), Boston Children's Hospital, Harvard University, Boston, Massachusetts
| | - O Gevaert
- Stanford Center for Biomedical Informatics (M.Z., O.G., Z.W.)
| | - K W Yeom
- From the Department of Radiology (M.I., M.Z., K.S., E.T., B.L., K.W.Y.) .,Department of Radiology (K.W.Y.), Artificial Intelligence in Medicine and Imaging, Stanford University, Stanford, California
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14
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Nam HW, Cho YJ, Lim JA, Kim SJ, Kim H, Sim SY, Lim DG. Functional status of immune cells in patients with long-lasting type 2 diabetes mellitus. Clin Exp Immunol 2018; 194:125-136. [PMID: 30022471 DOI: 10.1111/cei.13187] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/11/2018] [Indexed: 12/13/2022] Open
Abstract
Although patients with diabetes contract infectious diseases at higher frequencies, and in more severe forms, compared to non-diabetics, the underlying defects of the immune function have not been defined clearly. To address this, we designed an immune monitoring protocol and analysed the functional status of various immune cells. Peripheral blood mononuclear cells (PBMCs) were stimulated with the proper ligands and the functional reactivity of each lineage of cells was subsequently measured. Patients with type 2 diabetes mellitus (T2DM) had PBMC composition ratios comparable to healthy controls, except for a higher frequency of B cell and effector T cell fractions. The capacity of myeloid cells to secrete proinflammatory cytokines was not diminished in terms of the sensitivity and magnitude of the response. Furthermore, cytolytic activity and interferon (IFN)-γ production of natural killer (NK) cells and CD8+ T cells were not decreased in T2DM patients. Phenotypical maturation of dendritic cells, indicated by the up-regulation of major histocompatibility complex (MHC) proteins and co-stimulatory molecules in response to lipopolysaccharide (LPS), was slightly enhanced in T2DM patients. Finally, the functional differentiation profiles of CD4+ T cells did not differ between T2DM patients and the control group. These data indicate that patients with long-lasting T2DM do not have any gross functional defects in immune cells, at least in circulating monocytes, dendritic cells, NK cells and T lymphocytes.
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Affiliation(s)
- H W Nam
- Division of Endocrinology, Department of Internal Medicine, Seoul, Korea
| | - Y J Cho
- Division of Endocrinology, Department of Internal Medicine, Seoul, Korea
| | - J A Lim
- Division of Endocrinology, Department of Internal Medicine, Seoul, Korea
| | - S J Kim
- Department of Family Medicine, National Medical Center, Seoul, Korea
| | - H Kim
- Center for Chronic Diseases, Seoul, Korea
| | - S Y Sim
- Research Institute, National Medical Center, Seoul, Korea
| | - D G Lim
- Center for Chronic Diseases, Seoul, Korea
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15
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Diware MS, Ganorkar SP, Park K, Chegal W, Cho HM, Cho YJ, Kim YD, Kim H. Dielectric function, critical points, and Rydberg exciton series of WSe 2 monolayer. J Phys Condens Matter 2018; 30:235701. [PMID: 29714172 DOI: 10.1088/1361-648x/aac187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The complex dielectric function ([Formula: see text]) of WSe2 monolayer grown by atomic layer deposition is investigated using spectroscopic ellipsometry. Band structure parameters are obtained by standard line-shape analysis of the second-energy-derivative of [Formula: see text] spectra. The fundamental band gap is observed at 2.26 eV, corresponds to transition between valence band (VB) maximum at the K point and conduction band (CB) minimum at Q point in the Brillouin zone (BZ). Two strong so-called A and B excitonic peaks in [Formula: see text] spectra originate from vertical transitions from spin-orbit split (0.43 eV) VB to CB at K point of the BZ. Binding energies of A and B exactions are 0.71 and 0.28 eV, respectively. Well resolved five excited excitons states has been detected within the spectral region between A and B. Energy profile of the Rydberg series shows significant deviation from the hydrogenic behavior, discussed in connection with the 2D hydrogen model. Results presented here will improve our understanding about the optical response of 2D materials and will help to design better optoelectronic applications and validate theoretical considerations.
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Affiliation(s)
- M S Diware
- CeNSCMR and Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea
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16
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Lee JH, Cho YJ, Park JJ, Oh IY, Choi DJ. P888Prognostic implication of ventricular conduction disturbance pattern in hospitalized patients with acute heart failure syndrome. Europace 2018. [DOI: 10.1093/europace/euy015.490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- J H Lee
- Seoul National University Bundang Hospital, Cardiovascular center, Seongnam, Korea Republic of
| | - Y J Cho
- Seoul National University Bundang Hospital, Cardiovascular center, Seongnam, Korea Republic of
| | - J J Park
- Seoul National University Bundang Hospital, Cardiovascular center, Seongnam, Korea Republic of
| | - I Y Oh
- Seoul National University Bundang Hospital, Cardiovascular center, Seongnam, Korea Republic of
| | - D J Choi
- Seoul National University Bundang Hospital, Cardiovascular center, Seongnam, Korea Republic of
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17
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Cho YJ, Jo WY, Oh H, Koo CH, Oh J, Cho JY, Yu KS, Jeon Y, Kim TK. Performance of the Minto model for the target-controlled infusion of remifentanil during cardiopulmonary bypass. Anaesthesia 2017; 72:1196-1205. [PMID: 28891056 DOI: 10.1111/anae.14019] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/08/2017] [Indexed: 02/05/2023]
Abstract
We studied the predictive performance of the Minto pharmacokinetic model during cardiopulmonary bypass in patients undergoing cardiac surgery. Patients received remifentanil target-controlled infusion using the Minto model during total intravenous anaesthesia with propofol. From 56 patients, 275 arterial blood samples were drawn before, during and after bypass to determine the plasma concentration of remifentanil, and the predicted concentrations were recorded at each time. For pooled data, the median prediction error and median absolute prediction error were 21.3% and 21.8%, respectively, and 22.1% and 22.3% during bypass. Both were 148.4% during hypothermic circulatory arrest and measured concentrations were more than three times greater than predicted (26.9 (17.0) vs. 7.1 (1.6) ng.ml-1 ). The Minto model showed considerable bias but overall acceptable precision during bypass. The target concentration of remifentanil should be reduced when using the Minto model during hypothermic circulatory arrest.
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Affiliation(s)
- Y J Cho
- Department of Anaesthesiology and Pain Medicine, Seoul National University Hospital, Seoul, South Korea
| | - W Y Jo
- Department of Anaesthesiology and Pain Medicine, Seoul National University Hospital, Seoul, South Korea
| | - H Oh
- Department of Anaesthesiology and Pain Medicine, Seoul National University Hospital, Seoul, South Korea
| | - C-H Koo
- CHA Bundang Medical Centre, Department of Anaesthesiology and Pain Medicine, Seongnam-si, South Korea
| | - J Oh
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, South Korea
| | - J-Y Cho
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, South Korea
| | - K-S Yu
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, South Korea
| | - Y Jeon
- Department of Anaesthesiology and Pain Medicine, Seoul National University Hospital, Seoul, South Korea
| | - T K Kim
- Department of Anaesthesiology and Pain Medicine, Seoul National University Hospital, Seoul, South Korea
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18
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Kim M, Cho YJ, Lee CH, Lee SC. Effect of intravitreal dexamethasone implant on retinal and choroidal thickness in refractory diabetic macular oedema after multiple anti-VEGF injections. Eye (Lond) 2016; 30:718-25. [PMID: 26939558 DOI: 10.1038/eye.2016.23] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Accepted: 01/05/2016] [Indexed: 11/09/2022] Open
Abstract
AimsTo investigate the effect of intravitreal dexamethasone implant (IVD) on central foveal thickness (CFT), choroidal thickness (CT) and its correlation with visual acuity in eyes with refractory diabetic macular oedema (DMO).MethodsThis was a retrospective interventional case-series. Thirty-five eyes of 35 patients were treated with a single injection of IVD because of refractory DMO with CFT over 300 μm, and persistent intraretinal and subretinal fluid despite of multiple intravitreal bevacizumab injections. Patients were followed-up for 6 months for the evaluation of CFT and subfoveal CT by spectral-domain optical coherence tomography.ResultsAll eyes (mean age: 59.4±12.35 years; 18 males, 17 females) had been previously treated with multiple bevacizumab injections and showed persistent DMO (mean number of injections 4.08±2.98) The preoperative logMAR BCVA was 0.49±0.24, which gradually improved to 0.46±0.32 at 6 months (P=0.652) and 26% gained two or more lines of Snellen visual acuity. At baseline, the mean CFT was 526.29±123.48 μm, which significantly improved to 316.15±100.09 μm at 3 months (P<0.001). However, CFT deteriorated to 457.07±136.53 μm at 6 months (P=0.051). Similarly, the mean preoperative subfoveal CT was 288.91±36.47 μm and it decreased to 266.85±30.93 μm at 3 months (P<0.01), but increased to 278.63±32.55 μm at 6 months (P=0.137). The reduction of CFT from baseline showed significant correlation with that of subfoveal CT at 3 months (P=0.041) and at 6 months (P=0.008).ConclusionsIn DMO refractory to multiple bevacizumab injections, IVD significantly reduced CFT and subfoveal CT, with BCVA improvement in one-fourth of the patients. The reduction of CFT showed significant correlation with reduction of subfoveal CT.
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Affiliation(s)
- M Kim
- Department of Ophthalmology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Y J Cho
- Department of Ophthalmology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - C H Lee
- Department of Ophthalmology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - S C Lee
- Department of Ophthalmology, Institute of Vision Research, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
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Cho YJ, Lee JH, Shin DJ, Park KH. Comparison of short wrist transverse open and limited open techniques for carpal tunnel release: a randomized controlled trial of two incisions. J Hand Surg Eur Vol 2016; 41:143-7. [PMID: 26353946 DOI: 10.1177/1753193415603968] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/10/2014] [Accepted: 07/10/2015] [Indexed: 02/03/2023]
Abstract
UNLABELLED The purpose of this randomized controlled trial was to compare outcomes of limited open and short wrist transverse techniques in patients with carpal tunnel syndrome. In a single centre randomized controlled trial, 84 patients with idiopathic carpal tunnel syndrome were randomized before surgery to limited open or short wrist transverse open carpal tunnel release. The patients were evaluated at 6 weeks, 3 months, 6 months, and 1 and 2 years after surgery. At every follow-up, the Brigham and Women's Carpal Tunnel Questionnaire scores, scar discomfort, and subjective patient satisfaction were evaluated. Two years after surgery, five patients were lost to follow-up. The groups had similar Brigham and Women's Carpal Tunnel Questionnaire Symptom Severity and Functional Status scores and subjective satisfaction scores. The incidence of scar discomfort was not significantly different between the two groups on serial postoperative follow-up. Short wrist transverse open release surgery showed similar early postoperative symptoms and subjective and functional outcomes to limited open release. LEVEL OF EVIDENCE II.
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Affiliation(s)
- Y J Cho
- Department of Orthopedic Surgery, Kyung Hee University, Seoul, Korea
| | - J H Lee
- Department of Orthopedic Surgery, Kyung Hee University, Seoul, Korea
| | - D J Shin
- Department of Orthopedic Surgery, Kyung Hee University, Seoul, Korea
| | - K H Park
- Department of Orthopedic Surgery, Kyung Hee University, Seoul, Korea
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20
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Shin J, Kim Y, Lee H, Lee J, Kim KS, Cho YJ, Jo YH, Rhu H, Kim KS, Lee SM, Min J, Park G, Yoon J, Park SI, Lee YJ. Transcultural adaptation and validation of familial satisfaction in the intensive care unit in Korea: preliminary study. Intensive Care Med Exp 2015. [PMCID: PMC4796308 DOI: 10.1186/2197-425x-3-s1-a654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022] Open
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Yoon J, Lim G, Min J, Park G, Shin JY, Park SI, Cho YJ, Lee YJ. How much are family members satisfied with the intensive care unit in south korea? Intensive Care Med Exp 2015. [PMCID: PMC4798193 DOI: 10.1186/2197-425x-3-s1-a657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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22
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Chang Y, Moon JY, Cho YJ, Lee SM, Jeon K, Kim SC, Kim YS, Chong YP, Kim YS, Hong SB. The current pathogens and treatment of hospital-acquired pneumonia/ventilator-associated pneumonia in medical intensive care units. Intensive Care Med Exp 2015. [PMCID: PMC4798512 DOI: 10.1186/2197-425x-3-s1-a707] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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23
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Cho YJ, Lee KH, Ahn JH, Hong CK, Ha YR. Evaluation of a novel simulation method of teaching B-lines: hand ultrasound with a wet foam dressing material. Crit Ultrasound J 2015. [PMCID: PMC4401507 DOI: 10.1186/2036-7902-7-s1-a30] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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24
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Cho YJ, Lee JH, Shin DJ, Park KH. Comparison of short wrist transverse open and limited open techniques for carpal tunnel release: a randomized controlled trial of two incisions. J Hand Surg Eur Vol 2015. [PMID: 26353946 DOI: 10.1177/1753193415603968.] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
UNLABELLED The purpose of this randomized controlled trial was to compare outcomes of limited open and short wrist transverse techniques in patients with carpal tunnel syndrome. In a single centre randomized controlled trial, 84 patients with idiopathic carpal tunnel syndrome were randomized before surgery to limited open or short wrist transverse open carpal tunnel release. The patients were evaluated at 6 weeks, 3 months, 6 months, and 1 and 2 years after surgery. At every follow-up, the Brigham and Women's Carpal Tunnel Questionnaire scores, scar discomfort, and subjective patient satisfaction were evaluated. Two years after surgery, five patients were lost to follow-up. The groups had similar Brigham and Women's Carpal Tunnel Questionnaire Symptom Severity and Functional Status scores and subjective satisfaction scores. The incidence of scar discomfort was not significantly different between the two groups on serial postoperative follow-up. Short wrist transverse open release surgery showed similar early postoperative symptoms and subjective and functional outcomes to limited open release. LEVEL OF EVIDENCE II.
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Affiliation(s)
- Y J Cho
- Department of Orthopedic Surgery, Kyung Hee University, Seoul, Korea
| | - J H Lee
- Department of Orthopedic Surgery, Kyung Hee University, Seoul, Korea
| | - D J Shin
- Department of Orthopedic Surgery, Kyung Hee University, Seoul, Korea
| | - K H Park
- Department of Orthopedic Surgery, Kyung Hee University, Seoul, Korea
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Eom HJ, Shin JH, Cho YJ, Nam DH, Ko GY, Yoon HK. Transarterial embolisation of renal arteriovenous malformation: safety and efficacy in 24 patients with follow-up. Clin Radiol 2015; 70:1177-84. [PMID: 26183132 DOI: 10.1016/j.crad.2015.06.079] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Revised: 05/06/2015] [Accepted: 06/05/2015] [Indexed: 11/29/2022]
Abstract
AIM To evaluate the efficacy and safety of renal artery embolisation (RAE) for renal arteriovenous malformation (AVM) as well as its outcomes. MATERIALS AND METHODS The technical and clinical success rates, radiological and laboratory findings, and complications of RAE for 31 renal AVMs in 24 patients (M:F=9:15, mean age 46 years) at two separate medical institutions were retrospectively evaluated. Technical success was defined as complete occlusion of feeding arteries with no residual nidus seen on post-treatment angiography. Clinical failure was defined as recurrence of haematuria, presence of AVM on follow-up ultrasound or computed tomography, repeated RAE or surgery for the control of haematuria. Overall clinical success was defined as resolution haematuria or disappearance of AVM on follow-up imaging after single or multiple sessions of RAE. RESULTS Types of renal AVM were AVM, arterio-venous fistula (AVF) with intranidal aneurysm, and acquired AVF in 19, 1, and 4 patients, respectively. 18 patients (75%) underwent a single session of RAE, while 6 patients (25%) had two or more sessions of RAE. The level of embolisation was feeder, segmental artery, and main renal artery in 28 (90%), 2 (6%), and 1 (4%) procedures, respectively. Coil, n-butyl 2-cyanoacrylate, and polyvinyl alcohol were the most frequently chosen embolic materials and were used in 19, 14, and 8 procedures, respectively. The clinical success rate after initial RAE was 67% (16/24). Overall clinical success rate, including multisession RAE, was 88% (21/24). The technical success rate of 31 procedures was 65% (20/31). Among 11 technical failures in 10 patients, 4 achieved clinical success without additional RAE, 3 underwent second session RAE to achieve clinical success, and 3 patients underwent nephrectomy due to recurrence. CONCLUSION RAE is a safe and effective treatment for renal AVM. Technical failure of RAE does not always lead to clinical failure and multiple embolisation sessions may be effective for recurrent renal AVM.
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Affiliation(s)
- H-J Eom
- Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
| | - J H Shin
- Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea.
| | - Y J Cho
- Department of Radiology, Busan Paik Hospital, Inje University College of Medicine, Busan, South Korea
| | - D H Nam
- Department of Radiology, Kyung Hee University Hospital at Gangdong, School of Medicine, Kyung Hee University, Seoul, South Korea
| | - G-Y Ko
- Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
| | - H-K Yoon
- Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
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Abstract
Previous studies support the important role of vascular endothelial growth factor (VEGF) and syndecan-4 in the pathogenesis of osteoarthritis (OA). Both VEGF and syndecan-4 are expressed by chondrocytes and both are involved in the regulation of matrix metalloproteinase-3, resulting in the activation of aggrecanase II (ADAMTS-5), which is essential in the pathogenesis of OA. However, the relationship between VEGF and syndecan-4 has not been established. As a pilot study, we assayed the expression of VEGF and syndecan-4 in cartilage samples and cultured chondrocytes from osteoarthritic knee joints and analysed the relationship between these two factors. Specimens were collected from 21 female patients (29 knees) who underwent total knee replacement due to severe medial OA of the knee (Kellgren-Lawrence grade 4). Articular cartilage samples, obtained from bone and cartilage excised during surgery, were analysed and used for chondrocyte culture. We found that the levels of expression of VEGF and syndecan-4 mRNA did not differ significantly between medial femoral cartilage with severe degenerative changes and lateral femoral cartilage that appeared grossly normal (p = 0.443 and 0.622, respectively). Likewise, the levels of expression of VEGF and syndecan-4 mRNA were similar in cultured chondrocytes from medial and lateral femoral cartilage. The levels of expression of VEGF and syndecan-4 mRNAs were significantly and positively correlated in cartilage explant (r = 0.601, p = 0.003) but not in cultured chondrocytes. These results suggest that there is a close relationship between VEGF and syndecan-4 in the cartilage of patients with OA. Further studies are needed to determine the exact pathway by which these two factors interact in the pathogenesis of OA.
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Affiliation(s)
- J S Oh
- University of Ulsan College of Medicine, Department of Orthopedic Surgery, Ulsan University Hospital, 290-3 Jeonha-dong, Dong-gu, Ulsan 682-714, Korea
| | - Y S Youm
- University of Ulsan College of Medicine, Department of Orthopedic Surgery, Ulsan University Hospital, 290-3 Jeonha-dong, Dong-gu, Ulsan 682-714, Korea
| | - S D Cho
- University of Ulsan College of Medicine, Department of Orthopedic Surgery, Ulsan University Hospital, 290-3 Jeonha-dong, Dong-gu, Ulsan 682-714, Korea
| | - S W Choi
- University of Ulsan College of Medicine, Department of Orthopedic Surgery, Ulsan University Hospital, 290-3 Jeonha-dong, Dong-gu, Ulsan 682-714, Korea
| | - Y J Cho
- University of Ulsan College of Medicine, Department of Orthopedic Surgery, Ulsan University Hospital, 290-3 Jeonha-dong, Dong-gu, Ulsan 682-714, Korea
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Perreault S, Ramaswamy V, Achrol AS, Chao K, Liu TT, Shih D, Remke M, Schubert S, Bouffet E, Fisher PG, Partap S, Vogel H, Taylor MD, Cho YJ, Yeom KW. MRI surrogates for molecular subgroups of medulloblastoma. AJNR Am J Neuroradiol 2014; 35:1263-9. [PMID: 24831600 DOI: 10.3174/ajnr.a3990] [Citation(s) in RCA: 186] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
BACKGROUND AND PURPOSE Recently identified molecular subgroups of medulloblastoma have shown potential for improved risk stratification. We hypothesized that distinct MR imaging features can predict these subgroups. MATERIALS AND METHODS All patients with a diagnosis of medulloblastoma at one institution, with both pretherapy MR imaging and surgical tissue, served as the discovery cohort (n = 47). MR imaging features were assessed by 3 blinded neuroradiologists. NanoString-based assay of tumor tissues was conducted to classify the tumors into the 4 established molecular subgroups (wingless, sonic hedgehog, group 3, and group 4). A second pediatric medulloblastoma cohort (n = 52) from an independent institution was used for validation of the MR imaging features predictive of the molecular subtypes. RESULTS Logistic regression analysis within the discovery cohort revealed tumor location (P < .001) and enhancement pattern (P = .001) to be significant predictors of medulloblastoma subgroups. Stereospecific computational analyses confirmed that group 3 and 4 tumors predominated within the midline fourth ventricle (100%, P = .007), wingless tumors were localized to the cerebellar peduncle/cerebellopontine angle cistern with a positive predictive value of 100% (95% CI, 30%-100%), and sonic hedgehog tumors arose in the cerebellar hemispheres with a positive predictive value of 100% (95% CI, 59%-100%). Midline group 4 tumors presented with minimal/no enhancement with a positive predictive value of 91% (95% CI, 59%-98%). When we used the MR imaging feature-based regression model, 66% of medulloblastomas were correctly predicted in the discovery cohort, and 65%, in the validation cohort. CONCLUSIONS Tumor location and enhancement pattern were predictive of molecular subgroups of pediatric medulloblastoma and may potentially serve as a surrogate for genomic testing.
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Affiliation(s)
- S Perreault
- From the Department of Neurology (S. Perreault, S.S., P.G.F., S. Partap, Y.J.C.), Division of Child NeurologyDivision of Child Neurology (S. Perreault), Centre Hospitalier Universitaire Sainte-Justine, Montreal, Quebec, Canada
| | - V Ramaswamy
- Division of Neurosurgery (V.R., D.S., M.R., M.D.T.)Labatt Brain Tumour Research Centre (V.R., D.S., M.R., E.B., M.D.T.)Department of Laboratory Medicine and Pathobiology (V.S., D.S., M.R., M.D.T.), University of Toronto, Toronto, Ontario, Canada
| | - A S Achrol
- Department of Neurosurgery (A.S.A., K.C.)
| | - K Chao
- Department of Neurosurgery (A.S.A., K.C.)
| | - T T Liu
- Department of Radiology (T.T.L.)
| | - D Shih
- Division of Neurosurgery (V.R., D.S., M.R., M.D.T.)Labatt Brain Tumour Research Centre (V.R., D.S., M.R., E.B., M.D.T.)Department of Laboratory Medicine and Pathobiology (V.S., D.S., M.R., M.D.T.), University of Toronto, Toronto, Ontario, Canada
| | - M Remke
- Division of Neurosurgery (V.R., D.S., M.R., M.D.T.)Labatt Brain Tumour Research Centre (V.R., D.S., M.R., E.B., M.D.T.)Department of Laboratory Medicine and Pathobiology (V.S., D.S., M.R., M.D.T.), University of Toronto, Toronto, Ontario, Canada
| | - S Schubert
- From the Department of Neurology (S. Perreault, S.S., P.G.F., S. Partap, Y.J.C.), Division of Child Neurology
| | - E Bouffet
- Labatt Brain Tumour Research Centre (V.R., D.S., M.R., E.B., M.D.T.)Division of Pediatric Hematology/Oncology (E.B), Hospital for Sick Children, Toronto, Ontario, Canada
| | - P G Fisher
- From the Department of Neurology (S. Perreault, S.S., P.G.F., S. Partap, Y.J.C.), Division of Child Neurology
| | - S Partap
- From the Department of Neurology (S. Perreault, S.S., P.G.F., S. Partap, Y.J.C.), Division of Child Neurology
| | - H Vogel
- Richard M. Lucas Center for Imaging, and Department of Pathology (H.V.), Stanford University, Stanford, California
| | - M D Taylor
- Division of Neurosurgery (V.R., D.S., M.R., M.D.T.)Labatt Brain Tumour Research Centre (V.R., D.S., M.R., E.B., M.D.T.)Department of Laboratory Medicine and Pathobiology (V.S., D.S., M.R., M.D.T.), University of Toronto, Toronto, Ontario, Canada
| | - Y J Cho
- From the Department of Neurology (S. Perreault, S.S., P.G.F., S. Partap, Y.J.C.), Division of Child Neurology
| | - K W Yeom
- Department of Radiology (K.W.Y.), Lucile Packard Children's Hospital at Stanford University, Palo Alto, California
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Kwon SY, Kim IS, Bae JE, Kang JW, Cho YJ, Cho NS, Lee SW. Pathogen inactivation efficacy of Mirasol PRT System and Intercept Blood System for non-leucoreduced platelet-rich plasma-derived platelets suspended in plasma. Vox Sang 2014; 107:254-60. [PMID: 24806328 DOI: 10.1111/vox.12158] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2013] [Revised: 03/14/2014] [Accepted: 04/13/2014] [Indexed: 11/28/2022]
Abstract
BACKGROUND AND OBJECTIVES This study was conducted to evaluate the efficacy of pathogen inactivation (PI) in non-leucoreduced platelet-rich plasma-derived platelets suspended in plasma using the Mirasol PRT System and the Intercept Blood System. METHODS Platelets were pooled using the Acrodose PL system and separated into two aliquots for Mirasol and Intercept treatment. Four replicates of each viral strain were used for the evaluation. For bacteria, both low-titre (45-152 CFU/unit) inoculation and high-titre (7·34-10·18 log CFU/unit) inoculation with two replicates for each bacterial strain were used. Platelets with non-detectable bacterial growth and platelets inoculated with a low titre were stored for 5 days, and culture was performed with the BacT/ALERT system. RESULTS The inactivation efficacy expressed as log reduction for Mirasol and Intercept systems for viruses was as follows: human immunodeficiency virus 1, ≥4·19 vs. ≥4·23; bovine viral diarrhoea virus, 1·83 vs. ≥6·03; pseudorabies virus, 2·73 vs. ≥5·20; hepatitis A virus, 0·62 vs. 0·76; and porcine parvovirus, 0·28 vs. 0·38. The inactivation efficacy for bacteria was as follows: Escherichia coli, 5·45 vs. ≥9·22; Staphylococcus aureus, 4·26 vs. ≥10·11; and Bacillus subtilis, 5·09 vs. ≥7·74. Postinactivation bacterial growth in platelets inoculated with a low titre of S. aureus or B. subtilis was detected only with Mirasol. CONCLUSION Pathogen inactivation efficacy of Intercept for enveloped viruses was found to be satisfactory. Mirasol showed satisfactory inactivation efficacy for HIV-1 only. The two selected non-enveloped viruses were not inactivated by both systems. Inactivation efficacy of Intercept was more robust for all bacteria tested at high or low titres.
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Affiliation(s)
- S Y Kwon
- Blood Transfusion Research Institute, Korean Red Cross, Seoul, Korea
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Chiu KC, Boonsawat W, Cho SH, Cho YJ, Hsu JY, Liam CK, Muttalif AR, Nguyen HD, Nguyen VN, Wang C, Kwon N. Patients' beliefs and behaviors related to treatment adherence in patients with asthma requiring maintenance treatment in Asia. J Asthma 2014; 51:652-9. [PMID: 24580369 PMCID: PMC4133971 DOI: 10.3109/02770903.2014.898772] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Objectives To identify patients’ beliefs or behaviors related to treatment adherence and to assess association between asthma control and adherence in Asian patients with asthma. Methods We conducted a cross-sectional observational study of adult patients with asthma from specialist clinics in six Asian countries. Patients who were deemed by their treating physicians to require a maintenance treatment with an inhaler for at least 1 year were recruited. Patients completed a 12-item questionnaire related to health beliefs and behaviors, the 8-item Morisky Medication Adherence Scale (MMAS-8), the Asthma Control Test (ACT™), and the Standardized Asthma Quality of Life Questionnaire (AQLQ-S). Results Of the 1054 patients recruited, 99% were current users of inhaled corticosteroids. The mean ACT score was 20.0 ± 4.5 and 64% had well-controlled asthma. The mean MMAS-8 score was 5.5 ± 2.0 and 53% were adherent. Adherence was significantly associated with patients’ understanding of the disease and inhaler techniques, and with patients’ acceptance of inhaler medicines in terms of benefits, safety, convenience, and cost (p < 0.01 for all). In multivariate analysis, three questions related to patients’ acceptance of inhaler medicines remained significantly associated with poor adherence, after adjusting for potential confounders: “I am not sure inhaler type medicines work well” (p = 0.001), “Taking medicines more than once a day is inconvenient” (p = 0.002), and “Sometimes I skip my inhaler to use it over a longer period” (p < 0.001). Conclusions Our study showed that patients’ acceptance of the benefits, convenience and cost of inhaler medications have a significant impact on treatment adherence in the participating Asian countries.
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Affiliation(s)
- K-C Chiu
- Division of Chest, Department of Internal Medicine, Lotung Poh-Ai Hospital , Luodong , Taiwan
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Heo DH, Cho YJ, Sheen SH, Hong MS, Cho SM, Park SH. 3D reconstructions of spinal segmental arteries using CT angiography: applications in minimally invasive spinal procedures. AJNR Am J Neuroradiol 2010; 31:1635-9. [PMID: 20507934 DOI: 10.3174/ajnr.a2137] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Injury to spinal segmental arteries may potentially occur during spinal surgery, particularly during anterior or minimally invasive approaches. Use of a noninvasive radiologic tool to evaluate these arteries before surgery may reduce this risk. MATERIAL AND METHODS We performed spinal CT angiography and reconstructed 3D images of segmental arteries in 41 patients. We classified the pathways and locations of the segmental arteries into 4 zones (A, B, C, and D) according to pedicle and vertebral endplates. We designated segmental arteries from T8 to L1 as "high-level segmental arteries" and those from L2 to L4, as "low-level segmental arteries." We compared the distribution of segmental arteries between these 2 groups. We also investigated anatomic variations of segmental arteries and the rate of occurrence of the artery of Adamkiewicz. RESULTS In all patients, 3D reconstruction images from spinal CT angiography clearly showed the pathways of segmental arteries on the vertebral bodies. Most of the segmental arteries passed the middle portion of the vertebral body (zones B and C). However, 51 of 738 segmental arteries (6.9%) had uncommon pathways (zones A and D), and segmental arteries from L2 to L4 had a higher incidence of uncommon pathways than higher level vertebrae (P < .05). We also observed 2 types of segmental artery anatomic variation, agenesis and dual supply. CONCLUSIONS We suggest that spinal CT angiography can help to precisely visualize the spinal segmental arteries and surrounding bony structures and can aid clinicians in deciding on optimal approaches for spinal surgery.
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Affiliation(s)
- D H Heo
- Departments of Neurosurgery, Chuncheon Sacred Heart Hospital, Hallym University College of Medicine, 153 Kyo-dong,Chuncheon-shi, Kangwon-do, Korea
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Krishnan H, Yoon TR, Park KS, Cho YJ. Ischial Tuberosity Tuberculosis : An Unusual Location and Presented as Chronic Gluteal Abscess. Malays Orthop J 2010. [DOI: 10.5704/moj.1003.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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Cho YJ, Kim KI, Chun YS, Rhyu KH, Kwon BK, Kim DY, Yoo MC. Radioisotope synoviorthesis with Holmium-166-chitosan complex in haemophilic arthropathy. Haemophilia 2010; 16:640-6. [PMID: 20148979 DOI: 10.1111/j.1365-2516.2009.02192.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Radiosynoviorthesis is a safe and easy method for synovectomy in haemophilic arthropathy. Various agents have been used in radiosynoviorthesis, especially newly developed agent Holmium-166-chitosan complex has good clinical outcome. This study analysed clinical results and radiologic evaluation of radioisotope synoviorthesis using Holmium-166-chitosan complex in haemophilic arthropathy. From March 2001 to December 2003, 58 radiosynoviorthesis were performed in 53 haemophiliacs. The average age at procedure was 13.8 years. The Arnold and Hilgartner stage of the patients was from I to IV. Holmium-166-chitosan complex was injected in 31 ankle joints, 19 elbow joints and 8 knee joints. Average follow-up was 33 months since primary procedure. The range of motion of each joint, frequency of intra-articular bleeding and factor dose used were analysed for clinical assessment. There was no significant improvement of range of motion in affected joints. After procedure, the average frequency of bleeding of the elbow joint has decreased from 3.76 to 0.47 times per month, the knee joint from 5.87 to 1.12 times per month, and the ankle joint from 3.62 to 0.73 times per month respectively (P < 0.05). After treatment, the average coagulation factor dose injected was significantly decreased to 779.3 units per month from 2814.8 units per month before treatment (P < 0.001). Radioisotope synoviorthesis with Holmium-166-chitosan complex in haemophilic arthropathy is a very safe and simple procedure with the expectation of a satisfactory outcome without serious complication. It has excellent bleeding control effect on target joint and the need for substitution of coagulation factor concentrate can be reduced.
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Affiliation(s)
- Y J Cho
- Department of Orthopaedic Surgery, Kyung Hee Medical Center, School of Medicine, Kyung Hee University, Seoul, South Korea
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Abstract
AIMS Low serum nerve growth factor (NGF) levels have been reported in patients with diabetic peripheral neuropathy (DPN), but the role of NGF in the development of neuropathy is unclear. Thus, we investigated the associations of serum NGF level and NGF receptor activity with the presence and severity of DPN. METHODS One hundred and thirty-six patients with Type 2 diabetes were included in this cross-sectional study. Serum NGF levels were measured by ELISA. Expressions of NGF receptors (TrkA and p75(NTR)) were measured by immunohistochemical staining. The presence and severity of DPN were assessed by neuropathy disability score (NDS) and by corneal nerve fibre length (cNFL) and nerve branch density (cNBD) using in vivo confocal microscopy. RESULTS Patients with DPN had higher serum NGF levels (56-451 pg/ml) than patients without DPN (4-54 pg/ml). However, in DPN patients, serum NGF was negatively associated with neuropathy severity (mild 222 +/- 64 pg/ml; moderate 114 +/- 17 pg/ml; severe 89 +/- 20 pg/ml). This negative association was consistent in all severity indices (NDS, P < 0.001; cNFL, P < 0.001; cNBD P = 0.010) even after adjustment for age, sex, diabetes duration, insulin use, fasting glucose and glycated haemoglobin. Although NGF receptor activities had significantly (P < 0.05) negative associations with the presence and severity of neuropathy, these associations were not significant when adjusted for other factors. CONCLUSIONS Serum NGF level was positively associated with the presence of DPN but negatively associated with neuropathy severity in DPN patients. The change in serum NGF might be a consequence of, rather than a contributor to, the early development of DPN.
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Affiliation(s)
- H C Kim
- Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, Korea
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Cho YJ, Han JY, Choi JS, Ahn HK, Ryu HM, Kim MY, Yang JH, Nava-Ocampo AA, Koren G. Prenatal multivitamins containing folic acid do not decrease prevalence of depression among pregnant women. J OBSTET GYNAECOL 2009; 28:482-4. [PMID: 18850419 DOI: 10.1080/01443610802196658] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Several studies have reported an association between depression and folic acid deficiency. We investigated whether intake of prenatal multivitamins containing folic acid (MVandFA) was associated with decreased rates of depression among pregnant women. A questionnaire was given to 1,314 low-risk pregnant women. Of them, 1,277 (97.2%) women completed the questionnaire. The overall prevalence of depression was 8.1%. Of 652 participants who did not take MVandFA, 9.4% had depression, whereas 6.9% of 624 women who had MVandFA had depression (p = 0.11). In a multivariate logistic regression analysis, family history of depression (adjusted OR 3.7; 95% CI 1.9-7.3) and premenstrual syndrome (adjusted OR 3.0, 95% CI 1.8-4.8) were identified as risk factors for depression during pregnancy. In conclusion, intake of MVandFA was not associated with lower rates of depression during pregnancy whereas family history of depression and personal history of premenstrual syndrome were significant risk factors.
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Affiliation(s)
- Y J Cho
- Department of Obstetrics and Gynecology, Cheil Hospital and Women's Healthcare Center, Sungkyunkwan University, School of Medicine, Seoul, Korea
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Qin X, Kang SM, Cho YJ. Convergence theorems on generalized equilibrium problems and fixed point problems with applications. Proc Estonian Acad Sci 2009. [DOI: 10.3176/proc.2009.3.04] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Chung JH, Chung SJ, Lee S, Kirby BJ, Borchers JA, Cho YJ, Liu X, Furdyna JK. Carrier-mediated antiferromagnetic interlayer exchange coupling in diluted magnetic semiconductor multilayers Ga1-xMnxAs/GaAs:Be. Phys Rev Lett 2008; 101:237202. [PMID: 19113587 DOI: 10.1103/physrevlett.101.237202] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2008] [Indexed: 05/27/2023]
Abstract
We report the antiferromagnetic (AFM) interlayer exchange coupling between Ga0.97Mn0.03As ferromagnetic semiconductor layers separated by Be-doped GaAs spacers. Polarized neutron reflectivity reveals a characteristic splitting at the wave vector corresponding to twice the multilayer period, indicating that the coupling between the ferromagnetic layers is AFM. When the applied field is increased to above the saturation field, this AFM coupling is suppressed. This behavior is not observed when the spacers are undoped, suggesting that the observed AFM coupling is mediated by doped charge carriers.
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Affiliation(s)
- J-H Chung
- Department of Physics, Korea University, Seoul 136-713, Korea
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Affiliation(s)
- Y J Cho
- Department of Internal Medicine, Institute of Digestive Disease and Nutrition, Korea University College of Medicine, Seoul, Korea
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Diwanji SR, Cho YJ, Xin ZF, Yoon TR. Conservative treatment for transient osteoporosis of the hip in middle-aged women. Singapore Med J 2008; 49:e17-e21. [PMID: 18204754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Transient osteoporosis of the hip is a clinical entity that is being diagnosed and reported with increasing frequency. Its aetiology remains a matter of speculation, and the same remains true for its treatment. Many researchers have proposed different surgical and non-surgical treatment strategies; but the conservative approach, which takes the form of analgesics, intermittent traction, range of motion exercises, abductor strengthening exercises and restricted weight bearing, is preferred. The authors report on two patients, both women, aged 35 years and 42 years, respectively, with transient osteoporosis of the hip that were successfully treated using a conservative approach.
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Affiliation(s)
- S R Diwanji
- Center for Joint Disease, Chonnam National University Hwasun Hospital, 160 Ilsim-Ri, Hwasun-Eup, Hwasun-Gun, Jeonnam 519-809, Korea
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Lee JH, Bang KW, Cho YJ, Joh SJ. The hydrodynamic filter separator for removal of urban storm runoff. Water Sci Technol 2006; 53:243-52. [PMID: 16752787 DOI: 10.2166/wst.2006.229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
The majority of storm runoff pollution is trapped in particles smaller than 100 microm in diameter. Solid particles smaller than 100 microm in diameter are not easily separated by conventional types of hydrodynamic separator, and remain in suspension in overflow. To overcome this problem, a HDFS (hydrodynamic filter separator) has been developed for treatment of the microparticles in urban storm runoff. We conducted a laboratory scale study on treatable potential of microparticles using HDFS that combined HDS with perlite filter. To determine the efficiency for various operation conditions, a series of experiments was performed with different solids concentrations and surface loading rate. The operation ranges of surface loading rates were 100 to 2,800 m3/m2/day, and influent solids concentrations were varied from 800 to 1,900 mg/L. Also, the particle size distribution was monitored to investigate the effects of surface loading rates on the particle size. Results indicated that the HDFS-inside type showed greater efficiency at solids separation than the other type.
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Affiliation(s)
- J H Lee
- Department of Environmental Engineering, Chongju National College of Science and Technology, Jeungpyeong, Korea.
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Lee SK, Lee HJ, Min HY, Park EJ, Lee KM, Ahn YH, Cho YJ, Pyee JH. Antibacterial and antifungal activity of pinosylvin, a constituent of pine. Fitoterapia 2005; 76:258-60. [PMID: 15752644 DOI: 10.1016/j.fitote.2004.12.004] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2003] [Accepted: 12/14/2004] [Indexed: 10/25/2022]
Abstract
The antibacterial and antifungal activities of pinosylvin (3,5-dihydroxy-trans-stilbene), a constituent of pine, were studied and compared with those of resveratrol (3,5,4'-trihydroxy-trans-stilbene). Pinosylvin exhibited more potent growth inhibitory activity against Candida albicans and Saccharomyces cerevisiae.
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Affiliation(s)
- S K Lee
- College of Pharmacy, Ewha Womans University, Seoul 120-750, South Korea.
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Park SH, Cho YJ, Kim YL, Kwak JS, Kim YJ, Cho DK. Clopidogrel-induced membranous nephropathy. Clin Nephrol 2003; 60:218-20. [PMID: 14524588 DOI: 10.5414/cnp60218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Cho YJ, Lee JS. The effect of TGF-beta on the induction CD8 and NK1.1 expression in CTLL-2 cell line. J Investig Allergol Clin Immunol 2003; 13:259-65. [PMID: 14989115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023] Open
Abstract
BACKGROUND The presence of CD8+ T-cells expressing NK cell associated markers (TNK cells) has been observed in several experimental models, which suggests that NK cells may belong to the T-cell lineage. We used the CTLL-2 cell line, which is NK1.1+ CD3- TCR+ CD4- CD8- cells in the presence of IL-2, to investigate whether these cells can be switched to CD8+ or CD4+ cells, like TNK cells, by the TGF-beta. METHODS CTLL-2 cells were cultured with TGF-beta or other cytokines and activators in the presence of IL-2. In order to see the surface and intracytoplasmic antigen expression in a single-cell level, simultaneous surface CD4, CD8, TCR with NK1.1, and intracytoplasmic NK1.1 staining was performed and three-color flow cytometric analysis was performed. RESULTS During routine passage, less than 5% of cells were CD8a+, although 20-40% of cells expressed CD8a when treated with IL-2 + TGF-beta, whereas TPA + Calcium ionophore, IFN-gamma, and TNF-alpha cause no significant changes in the proportion of CD8+ cells. Twenty percent of CTLL-2 cells expressed NK1.1 with IL-2 treatment, and this expression was also increased up to 65%-70% with IL-2 + TNF-beta. Furthermore, most of the CD8 positive cells showed intracytoplasmic NK1.1. CONCLUSION Our results indicated that these would be useful models to investigate CD8 precursor potentials in populations of CD4-CD8- (double negative) cells and the relationship of NK1.1. These results also support a role for TGF-beta in T-cell differentiation and the hypothesis that T-cells and NK cells may have the same ontogeny.
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Affiliation(s)
- Y J Cho
- Dept. of Medicine, Ewha Women's University, College of Medicine, Ewha Women's Research Center, Seoul, Korea.
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Abstract
AIMS From a survey of submerged culture of edible mushrooms, a high pigment-producing fungus Paecilomyces sinclairii was selected and its optimal culture conditions investigated. METHODS AND RESULTS The optimal culture conditions for pigment production were as follows: inoculum age, 3 d; temperature, 25 degrees C; initial pH, 6.0; carbon source, 1.5% (w/v) soluble starch; nitrogen source, 1.5% (w/v) meat peptone. Although addition of 10 mmol l(-1) CaCl2 to the culture medium slightly increased pigment production, most of the bio-elements examined had no notable or detrimental effect on pigment production. CONCLUSIONS Under the optimal conditions obtained in the flask culture tested, a ninefold increase in pigment production (4.4 g l(-1)) was achieved using a 5(-l) batch fermenter. Paecilomyces sinclairii secreted water-soluble red pigment into the culture medium. The pigment colour was strongly dependent on the pH of the solution: red at pH 3-4, violet at pH 5-9 and pink at pH 10-12. SIGNIFICANCE AND IMPACT OF THE STUDY The high concentration of pigment (4.4 g l(-1)) produced by P. sinclairii demonstrates the possibility of commercial production of pigment by this strain, considering its relatively high production yield and light stability.
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Affiliation(s)
- Y J Cho
- Department of Biotechnology, Taegu University, Kyungsan, Kyungbuk, Korea
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Park JP, Kim YM, Kim SW, Hwang HJ, Cho YJ, Lee YS, Song CH, Yun JW. Effect of agitation intensity on the exo-biopolymer production and mycelial morphology in Cordyceps militaris. Lett Appl Microbiol 2002; 34:433-8. [PMID: 12028425 DOI: 10.1046/j.1472-765x.2002.01126.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
AIMS The influence of agitation intensity on Cordyceps militaris morphology and exo-biopolymer production was investigated in a 5 litre stirred vessel using a six-blade Rushton turbine impeller. METHODS AND RESULTS The mycelial morphology of C. militaris was characterized by means of image analysis, which included mean diameter, circularity, roughness and compactness of the pellets. The morphological parameters of the pellets grown under different stirring conditions were significantly different, which correspondingly altered exo-biopolymer production yields. CONCLUSIONS The compactness of the pellets was found to be the most critical parameter affecting exo-biopolymer biosynthesis; more compact pellets were formed at 150 rev min(-1) with maximum exo-biopolymer production (15 g l(-1)). SIGNIFICANCE AND IMPACT OF THE STUDY The results of this study suggest that morphological change of pellets is a good indicator for identifying the cell activity for exo-biopolymer production.
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Affiliation(s)
- J P Park
- Department of Biotechnology, Taegu University, Kyungsan, Kyungbuk, Korea
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Kim SW, Hwang HJ, Park JP, Cho YJ, Song CH, Yun JW. Mycelial growth and exo-biopolymer production by submerged culture of various edible mushrooms under different media. Lett Appl Microbiol 2002; 34:56-61. [PMID: 11849494 DOI: 10.1046/j.1472-765x.2002.01041.x] [Citation(s) in RCA: 84] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
AIMS The effect of synthetic media on the submerged mycelial growth and exo-biopolymer production in various edible mushrooms was investigated in shake flask culture. METHODS AND RESULTS Among 19 mushrooms examined, the relatively high yield in mycelial biomass and exo-biopolymer production was achieved in potato malt peptone (PMP) medium. In particular, Ganoderma lucidum NO. 1 and Phellinus linteus KCTC 6190 showed favourable growth in PMP medium with exo-biopolymer concentration of 1170 and 1520 mg l(-1), respectively. CONCLUSIONS Enhanced exo-biopolymer production was achieved from Ganoderma lucidum NO. 1 and Phellinus linteus KCTC 6190 in a 5L batch fermentor, indicating approximately 5000 and 2410 mg l(-1), respectively. SIGNIFICANCE AND IMPACT OF THE STUDY The exo-biopolymer production and mycelial growth from various mushrooms were found to be strongly controlled by different complex media.
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Affiliation(s)
- S W Kim
- Department of Biotechnology, Taegu University, Kyungsan, Kyungbuk 712-714, Korea
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Son BW, Cho YJ, Cho JS, Lee WK, Kim DS, Choi HD, Choi JS, Jung JH, Im KS, Choi WC. New galactolipids from the marine bacillariophycean microalga Nitzschia sp. Nat Prod Lett 2002; 15:299-306. [PMID: 11841113 DOI: 10.1080/10575630108041296] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Two new galactopyranosyldiacylglycerols have been isolated from the marine bacillariophycean microalga Nitzschia sp. and their structures were determined as (2S)-3-O-beta-D-galactopyranosyl-1,2-di-O-(9Z-hexadecenoyl)glycerol (1) and (2S)-3-O-beta-D-galactopyranosyl-1-O-(5Z,8Z,11Z,14Z,17Z-eicosapentaenoyl)-2-O-(9Z-hexadecenoyl)glycerol (2) by physicochemical evidence.
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Affiliation(s)
- B W Son
- Department of Chemistry, Pukyong National University, Pusan, Korea
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Abstract
OBJECTIVE To report diffusion-weighted imaging (DWI) findings and postulate the pathogenic mechanism of Wernicke's encephalopathy (WE). PATIENT A 47-year-old-woman presented with altered consciousness, ophthalmoplegia, and ataxia. DWI revealed the abnormal signal changes in periaqueductal gray matter, mamillary bodies and bilateral medial thalami. Apparent diffusion coefficient (ADC) map revealed the high signal intensity lesions in bilateral medial thalami, suggestive of vasogenic edema. The abnormal signal intensity lesions disappeared on follow-up imaging with clinical improvement. CONCLUSIONS Vasogenic edema plays an important role in the pathogenesis of WE and can be reversed by proper management. DWI findings in the early stage of WE may provide useful information about the prognosis.
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Affiliation(s)
- K S Hong
- Department of Neurology, Ilsan Paik Hospital, Inje University College of Medicine, Gyeonggi-do, South Korea.
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Hyun MH, Lee GS, Han SC, Cho YJ. Liquid chromatographic resolution of biphenyl dimethyl dicarboxylate (DDB) and its analogues on a chiral stationary phase. Enantiomer 2002; 6:313-8. [PMID: 11762927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
Racemic biphenyl dimethyl dicarboxylate (DDB) and its analogues have been successfully resolved on a commercial HPLC chiral column, (3R,4S)-Whelk-O 1. In general, cyclic amide analogues of DDB, which were derived from pyrrolidine or piperidine, showed greater enantioselectivity and greater retention than the corresponding N,N-dialkyl amide or N-alkyl amide or ester analogues. From these results, it was concluded that the carbonyl oxygen of the DDB analogues plays an important role as a hydrogen bond acceptor, though the steric bulkiness of the amide functionality of DDB analogues may be another factor governing chiral recognition. The conformational stability of the two enantiomers of DDB and its analogues was also found to be high enough for the two enantiomers to be resolvable on (3R,4S)-Whelk-O 1.
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Affiliation(s)
- M H Hyun
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Republic of Korea.
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Kim JM, Kim YJ, Cho YJ. Synergy of Bacteroides fragilis and Escherichia coli in the induction of KC gene expression in mouse peritoneal tissues. Scand J Infect Dis 2002; 32:643-9. [PMID: 11200375 DOI: 10.1080/003655400459568] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
B. fragilis induces cytokine expression, which can serve as a host signal leading to inflammatory reaction and abscess formation in the peritoneal cavity. We assessed the hypothesis that enteric bacteria may alter the B. fragilis-induced expression of KC genes in mouse peritoneal tissues (MPT). After C57BL/6 mice were inoculated with abscess-forming mixture containing B. fragilis in the presence or absence of E. coli, RNA was extracted from MPT. Expression of KC mRNA was quantified using reverse-transcription polymerase chain reaction and standard RNA. KC and TNFalpha proteins were measured by enzyme-linked immunosorbent assay. KC mRNA in MPT was upregulated following inoculation of B. fragilis and this was paralleled by increased KC protein secretion. When the mice were co-infected with E. coli and B. fragilis intraperitoneally, there was a synergistic increase in the expression of KC of MPT. Co-infection with L. acidophilus and B. fragilis downregulated KC mRNA expression, but co-infection with E. faecalis and B. fragilis synergistically increased KC expression in the infected MPT. Inhibition of TNFalpha production could downregulate KC expression in mixed infected MPT. These results suggest that enteric bacteria may significantly affect the KC signal produced by the host peritoneal cavity in response to B. fragilis infection.
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Affiliation(s)
- J M Kim
- Department of Microbiology and Institute of Biomedical Science, Hanyang University College of Medicine, Seoul, Korea
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Kwon OS, Lee HS, Koh DW, Cho YJ, Park YH, Park DK, Oh YL, Seo JH, Chun HJ, Um SH, Lee SW, Choi JH, Kim CD, Ryu HS, Hyun JH, Kim AR, Kim YS. A case of primary adenosquamous carcinoma of the liver presented with liver abscess. Korean J Intern Med 2001; 16:270-3. [PMID: 11855159 PMCID: PMC4578056 DOI: 10.3904/kjim.2001.16.4.270] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
Primary adenosquamous carcinoma of the liver is a very rare type of cholangiocarcinoma and is defined as a cancer containing both squamous and adenomatous components in the same lesion. Recently, we experienced a primary adenosquamous carcinoma of the liver presented as liver abscess. A 63-year-old man was presented with a 4-day history of fever and chill. The radiologic study showed a 4 cm-sized, central hypoattenuated mass with peripheral rim enhancement in the left lobe of the liver. Ultrasonography-guided aspiration and biopsy suggested an adenocarcinoma with abscess in the liver. At laparotomy, the tumor occupied the left lobe of the liver and invaded the right diaphragm. An extended left lobectomy and a partial excision of the involved diaphragm were done. Grossly, the tumor was 6 x 5 x 5 cm in size and had an eccentric necrosis. Microscopically, the tumor was composed of adenocarcinoma and squamous cell carcinoma with a transitional area.
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Affiliation(s)
- O S Kwon
- Department of Internal Medicine, Korea University, Ansan Hospital, 516 Kojan-Dong, Ansan City, Kyungki-Do, 425-020, Korea
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