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Zhu Z, Zhou T, Yu Q, Wang X, Xie J, Yan T, Ruan H, Cheung C. Study of Interfacial Adhesion and Re-Ir Alloy Coating in Chalcogenide Glass Molding. Langmuir 2023. [PMID: 37369105 DOI: 10.1021/acs.langmuir.3c01164] [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: 06/29/2023]
Abstract
Precision glass molding (PGM) has become an efficacious technique to fabricate high-precision optics. Chalcogenide (ChG) glass is increasingly used in thermal imaging, night vision, etc., because of its excellent infrared optical properties. Nevertheless, glass-mold interfacial adhesion has emerged as a pivotal issue within the PGM process. The interfacial adhesion during PGM has the potential to significantly undermine the performance of molded optics and reduce the longevity of molds. It is important to investigate interfacial adhesion behaviors in the PGM. In this study, the interfacial adhesion mechanism between ChG glass and the nickel-phosphorus (Ni-P) mold is analyzed using the cylindrical compression test. The effect of ChG glass internal stress on physical adhesion is investigated by finite element method (FEM) simulation. The spherical preform is proven to be capable of reducing the stress concentration and preventing physical adhesion. More importantly, a rhenium-iridium (Re-Ir) alloy coating is deposited on the Ni-P mold surface by ion sputtering to prevent atomic diffusion and resolve the problem of chemical adhesion. Finally, ChG glass microstructures with high accuracy are fabricated using the spherical ChG glass preform and the Re-Ir-coated Ni-P mold by PGM.
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Affiliation(s)
- Zhanchen Zhu
- School of Mechanical Engineering, Beijing Institute of Technology, No. 5 Zhongguancun South Street, Haidian District, Beijing 100081, P. R. China
- State Key Laboratory of Ultra-precision Machining Technology, The Hong Kong Polytechnic University, Hong Kong 999077, P. R. China
| | - Tianfeng Zhou
- School of Mechanical Engineering, Beijing Institute of Technology, No. 5 Zhongguancun South Street, Haidian District, Beijing 100081, P. R. China
| | - Qian Yu
- School of Mechanical Engineering, Beijing Institute of Technology, No. 5 Zhongguancun South Street, Haidian District, Beijing 100081, P. R. China
| | - Xibin Wang
- School of Mechanical Engineering, Beijing Institute of Technology, No. 5 Zhongguancun South Street, Haidian District, Beijing 100081, P. R. China
| | - Jiaqing Xie
- College of Mechanical and Electronic Engineering, Northwest A&F University, No. 3 Taicheng Road, Yangling 712100, P. R. China
| | - Tao Yan
- Phenix Optics Co., Ltd., No. 197, W Phenix Road, Shangrao, Jiangxi Province 334000, P. R. China
| | - Haihui Ruan
- State Key Laboratory of Ultra-precision Machining Technology, The Hong Kong Polytechnic University, Hong Kong 999077, P. R. China
| | - Chifai Cheung
- State Key Laboratory of Ultra-precision Machining Technology, The Hong Kong Polytechnic University, Hong Kong 999077, P. R. China
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Kong V, Cheung C, Buitendag J, Rajaretnam N, Xu W, Varghese C, Bruce J, Laing G, Clarke D. Abdominal stab wounds with retained knife: 15 years of experience from a major trauma centre in South Africa. Ann R Coll Surg Engl 2023; 105:407-412. [PMID: 35175869 PMCID: PMC10149242 DOI: 10.1308/rcsann.2021.0321] [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] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/28/2021] [Indexed: 11/22/2022] Open
Abstract
INTRODUCTION This study reviews our cumulative experience with the management of patients presenting with a retained knife following an abdominal stab wound (SW). METHODS A retrospective study was conducted at a major trauma centre in South Africa over a 15-year period from July 2006 to December 2020 including all patients who presented with a retained knife in the abdomen following a SW. RESULTS A total of 42 cases were included: 37 males (93%) with a mean age of 26 years. A total of 18 knives (43%) were in the anterior abdomen and 24 were posterior abdomen. Plain radiography was performed in 88% (37/42) of cases and computed tomography was performed in 81% (34/42); 90% (38/42) underwent extraction in the operating theatre. Laparotomy was performed in 62% (26/42). Of all the laparotomies performed, 77% (20/26) were positive for intra-abdominal organ or visceral injury. Overall morbidity was 31%. There were two mortalities (5%). Laparotomy was less commonly required for the posterior abdomen (33% (8/24) vs 100% (18/18), p<0.001). For retained knives in the anterior abdomen, 72% (13/18) of the laparotomies were positive for intra-abdominal organ or visceral injury. For the posterior abdomen, 7 of the 8 (88%) were positive for intra-abdominal organ or visceral injury. There were no differences in the need for intensive care unit admission, length of hospital stay, morbidities or mortalities. CONCLUSIONS Uncontrolled extraction of a retained knife in the abdomen outside of the operating theatre must be avoided. Retained knives in the anterior abdomen usually require formal laparotomy, but this is generally not required for posterior abdomen.
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Affiliation(s)
- V Kong
- University of the Witwatersrand, Johannesburg, South Africa
| | - C Cheung
- Chris Hani Baragwanath Academic Hospital, Johannesburg, South Africa
| | | | | | - W Xu
- University of Auckland, Auckland, New Zealand
| | - C Varghese
- University of Auckland, Auckland, New Zealand
| | - J Bruce
- University of KwaZulu Natal, Durban, South Africa
| | - G Laing
- University of KwaZulu Natal, Durban, South Africa
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Ng DKK, Cheung C, Wu WY. Better preparation for intubation. Hong Kong Med J 2023; 29:178-180. [PMID: 37041068 DOI: 10.12809/hkmj2210571] [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: 04/13/2023] Open
Affiliation(s)
- D K K Ng
- Department of Paediatrics, Hong Kong Sanatorium & Hospital, Hong Kong SAR, China
| | - C Cheung
- Department of Paediatrics, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - W Y Wu
- Research Department, Hong Kong Sanatorium & Hospital, Hong Kong SAR, China
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Thirayan V, Kong VY, Elsabagh A, Xu W, Rajaretnam N, Conradie B, Cheung C, Clarke DL, Bruce JL, Laing GL, Manchev V, Bekker W. High-grade renal trauma in children and adolescents can be successfully managed non-operatively. S AFR J SURG 2023; 61:56-60. [PMID: 37052277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/14/2023]
Abstract
BACKGROUND This paper reviews our experience with management of renal injuries in children and adolescents with a focus on the outcome of non-operative management (NOM). METHODS Retrospective review of the clinical characteristics, injury grade (I-III, low grade and IV and V high grade), management and outcomes of children ≤ 18 years old with renal trauma presenting to a major trauma centre in South Africa between December 2012 and October 2020. RESULTS Sixty-one children with a renal injury were identified with a median age of 13 (range 0-18) years. Forty-five were boys; blunt and penetrating mechanisms of trauma were sustained by 55 (90%) and six (10%) children, respectively. The median American Association for the Surgery of Trauma (AAST) grade of renal injury was 3 (range 1-5): this included eight (13%) with grade I, six (10%) with grade II, 17 (28%) with grade III, 20 (46%) with grade IV and 10 (16%) with grade V injuries. Forty children (66%) were successfully managed non-operatively and 21 required a laparotomy; of these six (28%) required nephrectomy. The overall renal salvage rate was 55/61 (90%). Children who required laparotomy were significantly more likely to have sustained a penetrating mechanism of injury (24% vs 2%) and have greater length of hospital stay (median 9 vs 3 days) compared to children managed non-operatively (p < 0.05). Children who underwent a nephrectomy had a significantly greater length of hospital stay (median 9 vs 4 days, p = 0.03); however, their demographics, outcomes developed complications. Two children (3%) died; one managed non-operatively and one with a laparotomy. CONCLUSION Paediatric renal trauma can be successfully managed non-operatively in over two-thirds of cases in this middle-income country. High grade of renal injury does not absolutely predict need for surgery or nephrectomy and can be managed non-operatively.
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Affiliation(s)
- V Thirayan
- Department of Surgery, Waikato Hospital, New Zealand
| | - V Y Kong
- Department of Surgery, Auckland City Hospital, New Zealand and Department of Surgery, University of the Witwatersrand, South Africa and Department of Surgery, University of KwaZulu-Natal, South Africa
| | - A Elsabagh
- Department of Surgery, St John of God Midland Public Hospital, Australia
| | - W Xu
- Department of Surgery, University of Auckland, New Zealand
| | - N Rajaretnam
- Department of Surgery, St James's Hospital, Ireland
| | - B Conradie
- Department of Surgery, University of Auckland, New Zealand
| | - C Cheung
- Department of Surgery, Chris Hani Baragwanath Academic Hospital, South Africa
| | - D L Clarke
- Department of Surgery, University of the Witwatersrand, South Africa and Department of Surgery, University of KwaZulu-Natal, South Africa
| | - J L Bruce
- Department of Surgery, University of KwaZulu-Natal, South Africa
| | - G L Laing
- Department of Surgery, University of KwaZulu-Natal, South Africa
| | - V Manchev
- Department of Surgery, University of KwaZulu-Natal, South Africa
| | - W Bekker
- Department of Surgery, University of KwaZulu-Natal, South Africa
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Wang S, Kong L, Wang C, Cheung C. Ultra-precision manufacturing of microlens arrays using an optimum machining process chain. Opt Express 2023; 31:2234-2247. [PMID: 36785241 DOI: 10.1364/oe.479696] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Accepted: 11/28/2022] [Indexed: 06/18/2023]
Abstract
There are still significant challenges in the accurate and uniform manufacturing of microlens arrays (MLAs) with advanced ultra-precision diamond cutting technologies due to increasingly stringent requirements and shape complexity. In this paper, an optimum machining process chain is proposed based on the integration of a micro-abrasive fluid jet polishing (MAFJP) process to improve the machining quality by single point diamond turning (SPDT). The MLAs were first machined and compensated by SPDT until the maximum possible surface quality was obtained. The MAFJP was used to correct the surface form error and reduce the nonuniformity for each lens. The polishing characterization was analyzed based on the computational fluid dynamics (CFD) method to enhance the polishing efficiency. To better polish the freeform surface, two-step tool path generation using a regional adaptive path and a raster and cross path was employed. Moreover, the compensation error map was also investigated by revealing the relationship between the material removal mechanism and the surface curvature and polishing parameters. A series of experiments were conducted to prove the reliability and capability of the proposed method. The results indicate that the two integrated machining processes are capable of improving the surface form accuracy with a decrease in PV value from 1.67 µm to 0.56 µm and also elimination of the nonuniform surface error for the lenses.
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Lee L, Kong VY, Cheung C, Rajaretnam N, Thirayan V, Bruce JL, Manchev V, Mills RP, Laing GL, Clarke DL. The neglected epidemic of trauma from interpersonal violence against the elderly in South Africa. S Afr J Surg 2022; 60:278-283. [PMID: 36477058 DOI: 10.17159/2078-5151/sajs3794] [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: 12/13/2022]
Abstract
BACKGROUND Geriatric injuries comprise a significant burden in the developed world but much less are known in the developing world setting. This study aims to review our experience of geriatric injuries with a focus on interpersonal violence (IPV) managed at a major trauma centre in South Africa. METHODS This was a retrospective study on all patients who were aged > 65 years admitted to our trauma centre from January 2013 to December 2020, based in Pietermaritzburg, South Africa. RESULTS Over the 8-year study period, 323 cases were included (62% male, mean age 72 years). Mechanism of injury: 80% blunt, 16% penetrating and 4% others. The median injury severity score (ISS) was 9. The median Charlson comorbidity index (CCI) for all 323 cases was 3. Diabetes (n = 53) was the most prevalent comorbidity which was followed by pulmonary disease (n = 23), cerebral vascular accidents (n = 16) and myocardial infarction (n = 15). Fifteen patients were on antiretroviral therapy (5%). Twenty-four per cent required surgical intervention. Eight per cent of cases experienced one or more complications. Twenty-five per cent (80/323) were related to IPV, 61% (49/80) of these were penetrating injuries and the remaining 31 cases were blunt injuries. Of the 49 cases of penetrating injuries, 33 were gunshot wounds (GSWs) and 16 were stab wounds (SWs) (1 GSW and 2 SWs were self-inflicted and were not included in IPV). Those cases that resulted from IPV were significantly more likely to require operative intervention, experience complications and longer lengths of hospital stay. Geriatric patients had poorer outcomes than non-geriatric patients and rural geriatric patients had worse outcomes than urban geriatric patients. CONCLUSION Although the burden of geriatric trauma in South Africa appears to be relatively low, it is associated with significant morbidity and mortality. Trauma from interpersonal violence is especially common and is associated with significantly worse outcomes than that of non-interpersonal violence-related trauma. Elderly rural trauma victims have worse outcomes than their urban counterparts.
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Affiliation(s)
- L Lee
- Department of Surgery, University of Auckland, New Zealand
| | - V Y Kong
- Department of Surgery, Auckland City Hospital, New Zealand and Department of Surgery, University of KwaZulu-Natal, South Africa
| | - C Cheung
- Department of Surgery, University of the Witwatersrand, South Africa and Department of Surgery, Chris Hani Baragwanath Hospital, South Africa
| | - N Rajaretnam
- Department of Surgery, St James's Hospital, Ireland
| | - V Thirayan
- Department of Psychiatry, Waikato Hospital, New Zealand
| | - J L Bruce
- Department of Surgery, University of KwaZulu-Natal, South Africa
| | - V Manchev
- Department of Surgery, University of Auckland, New Zealand
| | - R P Mills
- Department of Surgery, Life Entabeni Hospital, South Africa
| | - G L Laing
- Department of Surgery, University of KwaZulu-Natal, South Africa
| | - D L Clarke
- Department of Surgery, University of KwaZulu-Natal, South Africa and Department of Surgery, University of the Witwatersrand, South Africa
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Jiang R, Cheung C, Davies B, Cao J, Laksman Z, Krahn A. DETECTION OF CONGENITAL LONG QT SYNDROME WITH ARTIFICIAL INTELLIGENCE. Can J Cardiol 2022. [DOI: 10.1016/j.cjca.2022.08.081] [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: 11/02/2022] Open
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Reid R, Kong V, Xu W, Thirayan V, Cheung C, Rajaretnam N, Manchev V, Bekker W, Bruce JL, Laing G, Clarke DL. An audit of trauma laparotomy in children and adolescents highlights the role of damage control surgery and the need for a trauma systems approach to injury in this vulnerable population. S AFR J SURG 2022; 60:97-102. [PMID: 35851362] [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: 06/15/2023]
Abstract
BACKGROUND This study reviews the indications and outcome of emergency laparotomy for paediatric trauma in a South African trauma centre. METHODS This was a retrospective study of all children less than 18 years of age who underwent an emergency laparotomy for trauma between December 2012 and October 2020 at Grey's Hospital in Pietermaritzburg. RESULTS During the eight-year period under review, a total of 136 children of which 107 were male underwent a laparotomy for trauma. The median age was 14 years. There were 80 (57.1%) blunt mechanisms, and the rest were penetrating mechanisms. A total of 46 (33%) patients required ICU admission. Thirty-four patients developed a complication. These included nine cases of pneumonia, one case of renal failure, two patients developed abdominal collections, three woundrelated complications, three neurological complications and one miscellaneous complication. There were seven (5%) deaths. The penetrating cohort were older than the blunt cohort. Solid viscera were more likely to be injured in the blunt cohort and hollow viscera more likely in the penetrating cohort. A total of 16 (11%) patients underwent damage control surgery (DCS). Of this cohort, there were three female children. Six sustained blunt trauma and ten penetrating trauma. A total of six (37%) of these children died. CONCLUSION Emergency laparotomy for trauma in children is not infrequent in Pietermaritzburg and there is a high incidence of penetrating trauma in this cohort. The response to increased degrees of physiological derangement is the application of DCS. Ongoing efforts to develop and strengthen a paediatric trauma service appear to be justified.
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Affiliation(s)
- R Reid
- Department of Surgery, University of Auckland, New Zealand
| | - V Kong
- Department of Surgery, Auckland City Hospital, New Zeland, Department of Surgery, University of the Witwatersrand, South Africa and Department of Surgery, University of KwaZulu-Natal, South Africa
| | - W Xu
- Department of Surgery, University of Auckland, New Zealand
| | - V Thirayan
- Department of Surgery, Waikato Hospital, New Zealand
| | - C Cheung
- Department of Surgery, Chris Hani Baragwanath Academic Hospital, South Africa
| | - N Rajaretnam
- Department of Surgery, St James's Hospital, Ireland
| | - V Manchev
- Department of Surgery, University of KwaZulu-Natal, South Africa
| | - W Bekker
- Department of Surgery, University of KwaZulu-Natal, South Africa
| | - J L Bruce
- Department of Surgery, University of KwaZulu-Natal, South Africa
| | - G Laing
- Department of Surgery, University of KwaZulu-Natal, South Africa
| | - D L Clarke
- Department of Surgery, University of the Witwatersrand, South Africa and Department of Surgery, University of KwaZulu-Natal, South Africa
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Xie Y, Li Y, Cheung C. Design and Modeling of a Novel Tripteron-Inspired Triaxial Parallel Compliant Manipulator with Compact Structure. Micromachines (Basel) 2022; 13:mi13050678. [PMID: 35630145 PMCID: PMC9148049 DOI: 10.3390/mi13050678] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Revised: 04/20/2022] [Accepted: 04/24/2022] [Indexed: 02/01/2023]
Abstract
Compliant mechanisms are popular to the applications of micro/nanoscale manipulations. This paper proposes a novel triaxial parallel-kinematic compliant manipulator inspired by the Tripteron mechanism. Compared to most conventional triaxial compliant mechanisms, the proposed manipulator has the merits of structure compactness and being free of assembly error due to its unique configuration and the utilize of 3D printing technology. The compliance matrix modeling method is employed to determine the input stiffness of the compliant manipulator, and it is verified by finite-element analysis (FEA). Results show that the deviations between simulation works and the derived analytical models are in an acceptable range. The simulation results also reveal that the compliant manipulator can achieve a 16 μm × 16 μm × 16 μm cubic workspace. In this motion range, the observed maximum stress is much lower than the yield strength of the material. Moreover, the dynamic characteristics of the manipulator are investigated via the simulations as well.
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Reíd B, Kong V, Xu W, Thirayan V, Cheung C, Rajaretnam N, Manchev V, Bekker W, Bruce J, Laing G, Clarke D. An audit of trauma laparotomy in children and adolescents highlights the role of damage control surgery and the need for a trauma systems approach to injury in this vulnerable population. S AFR J SURG 2022. [DOI: 10.17159/2078-5151/sajs3732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND: This study reviews the indications and outcome of emergency laparotomy for paediatric trauma in a South African trauma centre. METHODS: This was a retrospective study of all children less than 18 years of age who underwent an emergency laparotomy for trauma between December 2012 and October 2020 at Grey's Hospital in Pietermaritzburg. RESULTS: During the eight-year period under review, a total of136 children of which 107 were male underwent a laparotomy for trauma. The median age was 14 years. There were 80 (57.1%) blunt mechanisms, and the rest were penetrating mechanisms. A total of 46 (33%) patients required ICU admission. Thirty-four patients developed a complication. These included nine cases of pneumonia, one case of renal failure, two patients developed abdominal collections, three wound-related complications, three neurological complications and one miscellaneous complication. There were seven (5%) deaths. The penetrating cohort were older than the blunt cohort. Solid viscera were more likely to be injured in the blunt cohort and hollow viscera more likely in the penetrating cohort. A total of 16 (11%) patients underwent damage control surgery (DCS). Of this cohort, there were three female children. Six sustained blunt trauma and ten penetrating trauma. A total of six (37%) of these children died. CONCLUSION: Emergency laparotomy for trauma in children is not infrequent in Pietermaritzburg and there is a high incidence of penetrating trauma in this cohort. The response to increased degrees of physiological derangement is the application of DCS. Ongoing efforts to develop and strengthen a paediatric trauma service appear to be justified.
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Kong V, Cheung C, Buitendag J, Rajaretnam N, Varghese C, Elsabagh A, Bekker W, Bruce J, Laing G, Clarke D. Management of penetrating thoracic trauma with retained knife blade: 15-year experience from a major trauma centre in South Africa. Ann R Coll Surg Engl 2021; 104:308-313. [PMID: 34931547 DOI: 10.1308/rcsann.2021.0182] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
INTRODUCTION This study reviews our experience with the management a retained knife in the setting of thoracic stab wounds. METHODS A retrospective study was conducted at a major trauma in South Africa over a 15-year period from January 2004 to December 2018. RESULTS There were 40 patients, of whom 37 were males (93%). Median age was 24 years; 78% of cases (31 of 40) were a retained knife and 23% (9 of 40) were a retained blade. The locations of the stab wounds were 19 (48%) anterior and 21 (53%) posterior. Plain x-ray was performed in 85% (34) of patients and computed tomography angiography was performed in 85% (34). Six patients had haemodynamic instability and were expedited to the operating room without further imaging. Three of these had cardiac tamponade and three a massive haemothorax. Simple extraction and wound exploration were performed in 58% (23 of 40) of cases and the remaining 43% (17 of 40) required operative exploration and extraction. The operative approach was anterolateral thoracotomy in nine cases, posterolateral thoracotomy in four and median sternotomy in three cases. One patient required extraction and concurrent vertebral laminectomy due to cord compression. Twelve patients (30%) experienced complications (nine wound sepsis and three hospital-acquired pneumonia). There was one mortality (3%). The median length of hospital stay was 6 days. CONCLUSION Uncontrolled extraction of a retained thoracic knife outside the operating room must be avoided. An unstable patient should proceed directly for operative exploration. For stable patients, cross-sectional imaging will allow for planned extraction in operating room.
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Affiliation(s)
- V Kong
- University of the Witwatersrand, Johannesburg, South Africa
| | - C Cheung
- Chris Hani Baragwanath Academic Hospital, Johannesburg, South Africa
| | | | | | - C Varghese
- University of Auckland, Auckland, New Zealand
| | - A Elsabagh
- Flinders Medical Centre, Adelaide, Australia
| | - W Bekker
- University of KwaZulu Natal, Durban, South Africa
| | - J Bruce
- University of KwaZulu Natal, Durban, South Africa
| | - G Laing
- University of KwaZulu Natal, Durban, South Africa
| | - D Clarke
- University of KwaZulu Natal, Durban, South Africa
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Cheung C, Ng CY, Lee KL, Wu KX, Chioh FWJ, Tan K, Siau A, Muthiah MD, Chen QF, Tan NS, Ng HH, Dan YY. Endothelial-T cell crosstalk contributes to vascular injury in fatty liver disease. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.3435] [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: 11/14/2022] Open
Abstract
Abstract
Cardiovascular complications are often the fundamental causes of death in non-alcoholic fatty liver disease (NAFLD) patients. While there are known systemic mediators in NAFLD that may induce vascular inflammation, the mechanism of endothelial dysfunction remain understudied. In this work, we harnessed the replicative potential of blood outgrowth endothelial cells (BOECs) to develop personalized cell lines from NAFLD patients and healthy controls. Our transcriptomic analysis showed that the top interactome network enriched in NAFLD BOECs comprised of several C-C and C-X-C chemokine ligands involved in immune cell chemotaxis. We previously reported T cell infiltration in mouse model of non-alcoholic steatohepatitis, and here, we confirmed enhanced endothelial chemokine signatures in arterial histological sections. To elucidate endothelial-immune crosstalk, we performed single-cell analysis on human peripheral blood mononuclear cells and found T cell intensification in NAFLD patients compared to healthy controls. Our immunoprofiling by flow cytometry further revealed that NAFLD patients possessed higher levels CD8+ memory cells. Functionally, T cells, instead of monocytes, adhered more pronouncedly to NAFLD BOECs. In evaluating the CXCL12-CXCR4 axis in chemotaxis, CXCR4 antagonist (AMD3100) substantially modulated the migration of patient-derived CD8+ T cells towards NAFLD BOECs, which was not observed in healthy endothelial-T cell chemotaxis coculture. Finally, we validated NAFLD-associated endothelial dysfunction by enumerating two folds more circulating endothelial cells, a biomarker of vascular injury, in the blood samples of NAFLD patients than healthy controls. Our work provides insights for translation to restore blood vessel health and potentially mitigate adverse vascular events in NAFLD.
Funding Acknowledgement
Type of funding sources: Public grant(s) – National budget only. Main funding source(s): Industrial Alignment Fund Pre-Positioning grant from the Agency for Science, Technology and Research, Singapore Endothelial-T cell crosstalk in NAFLD
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Affiliation(s)
- C Cheung
- Nanyang Technological University, Lee Kong Chian School of Medicine, Singapore, Singapore
| | - C Y Ng
- Nanyang Technological University, Lee Kong Chian School of Medicine, Singapore, Singapore
| | - K L Lee
- Nanyang Technological University, Lee Kong Chian School of Medicine, Singapore, Singapore
| | - K X Wu
- Nanyang Technological University, Lee Kong Chian School of Medicine, Singapore, Singapore
| | - F W J Chioh
- Nanyang Technological University, Lee Kong Chian School of Medicine, Singapore, Singapore
| | - K Tan
- Nanyang Technological University, Lee Kong Chian School of Medicine, Singapore, Singapore
| | - A Siau
- Nanyang Technological University, Lee Kong Chian School of Medicine, Singapore, Singapore
| | - M D Muthiah
- National University Health System, Singapore, Singapore
| | - Q F Chen
- Agency for Science, Technology and Research, Singapore, Singapore
| | - N S Tan
- Nanyang Technological University, Lee Kong Chian School of Medicine, Singapore, Singapore
| | - H H Ng
- Agency for Science, Technology and Research, Singapore, Singapore
| | - Y Y Dan
- National University Health System, Singapore, Singapore
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Aribo C, Correa J, Stuparich M, Cheung C, Nahas S, Behbehani S. 48 Analysis of the US FDA MAUDE database - how does robotic gynecologic surgery compare to other specialties? Am J Obstet Gynecol 2021. [DOI: 10.1016/j.ajog.2021.04.073] [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: 10/21/2022]
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Zhang C, Cheung C, Bulla B, Zhao C. An Investigation of the High-Frequency Ultrasonic Vibration-Assisted Cutting of Steel Optical Moulds. Micromachines (Basel) 2021; 12:mi12040460. [PMID: 33921717 PMCID: PMC8072909 DOI: 10.3390/mi12040460] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 04/13/2021] [Accepted: 04/16/2021] [Indexed: 11/16/2022]
Abstract
Ultrasonic vibration-assisted cutting (UVAC) has been regarded as a promising technology to machine difficult-to-machine materials such as tungsten carbide, optical glass, and hardened steel in order to achieve superfinished surfaces. To increase vibration stability to achieve optical surface quality of a workpiece, a high-frequency ultrasonic vibration-assisted cutting system with a vibration frequency of about 104 kHz is used to machine spherical optical steel moulds. A series of experiments are conducted to investigate the effect of machining parameters on the surface roughness of the workpiece including nominal cutting speed, feed rate, tool nose radius, vibration amplitude, and cutting geometry. This research takes into account the effects of the constantly changing contact point on the tool edge with the workpiece induced by the cutting geometry when machining a spherical steel mould. The surface morphology and surface roughness at different regions on the machined mould, with slope degrees (SDs) of 0°, 5°, 10°, and 15°, were measured and analysed. The experimental results show that the arithmetic roughness Sa of the workpiece increases gradually with increasing slope degree. By using optimised cutting parameters, a constant surface roughness Sa of 3 nm to 4 nm at different slope degrees was achieved by the applied high-frequency UVAC technique. This study provides guidance for ultra-precision machining of steel moulds with great variation in slope degree in the pursuit of optical quality on the whole surface.
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Affiliation(s)
- Canbin Zhang
- State Key Laboratory of Ultra-Precision Machining Technology, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China; (C.C.); (C.Z.)
- Correspondence: ; Tel.: +852-5623-2030
| | - Chifai Cheung
- State Key Laboratory of Ultra-Precision Machining Technology, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China; (C.C.); (C.Z.)
| | | | - Chenyang Zhao
- State Key Laboratory of Ultra-Precision Machining Technology, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China; (C.C.); (C.Z.)
- School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen 518055, China
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Walter CW, Spielman SE, Ponce R, Gibson ND, Yukich JN, Cheung C, Safronova MS. Observation of an Electric Quadrupole Transition in a Negative Ion: Experiment and Theory. Phys Rev Lett 2021; 126:083001. [PMID: 33709752 DOI: 10.1103/physrevlett.126.083001] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Accepted: 01/15/2021] [Indexed: 06/12/2023]
Abstract
The first direct experimental observation of an electric quadrupole (E2) absorption transition between bound states of an atomic negative ion has been made. The transition was observed in the negative ion of bismuth by resonant (1+1) photon detachment from Bi^{-} via ^{3}P_{2}→^{3}P_{0} excitation. The E2 transition properties were completely independently calculated using a hybrid theoretical approach to account for the strong multilevel electron interactions and relativistic effects. The experimental and ab initio theoretical results are in excellent agreement, providing valuable new insight into this complex system and forbidden transitions in negative ions more generally.
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Affiliation(s)
- C W Walter
- Department of Physics and Astronomy, Denison University, Granville, Ohio 43023, USA
| | - S E Spielman
- Department of Physics and Astronomy, Denison University, Granville, Ohio 43023, USA
| | - R Ponce
- Department of Physics and Astronomy, Denison University, Granville, Ohio 43023, USA
| | - N D Gibson
- Department of Physics and Astronomy, Denison University, Granville, Ohio 43023, USA
| | - J N Yukich
- Physics Department, Davidson College, Davidson, North Carolina 28035, USA
| | - C Cheung
- Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA
| | - M S Safronova
- Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA
- Joint Quantum Institute, National Institute of Standards and Technology and the University of Maryland, College Park, Maryland 20742, USA
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Cheung C, Starovoytov A, Parsa A, Andrade J, Krahn A, Bennett M, Saw J. IN-HOSPITAL AND LONG-TERM OUTCOMES AMONG PATIENTS WITH SPONTANEOUS CORONARY ARTERY DISSECTION PRESENTING WITH VENTRICULAR TACHYCARDIA/FIBRILLATION. Can J Cardiol 2020. [DOI: 10.1016/j.cjca.2020.07.103] [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: 11/28/2022] Open
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Cheung C, Safronova MS, Porsev SG, Kozlov MG, Tupitsyn II, Bondarev AI. Accurate Prediction of Clock Transitions in a Highly Charged Ion with Complex Electronic Structure. Phys Rev Lett 2020; 124:163001. [PMID: 32383935 DOI: 10.1103/physrevlett.124.163001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Accepted: 04/01/2020] [Indexed: 06/11/2023]
Abstract
We develop a broadly applicable approach that drastically increases the ability to predict the properties of complex atoms accurately. We apply it to the case of Ir^{17+}, which is of particular interest for the development of novel atomic clocks with a high sensitivity to the variation of the fine-structure constant and to dark matter searches. In general, clock transitions are weak and very difficult to identify without accurate theoretical predictions. In the case of Ir^{17+}, even stronger electric-dipole (E1) transitions have eluded observation despite years of effort, raising the possibility that the theoretical predictions are grossly wrong. In this work, we provide accurate predictions of the transition wavelengths and E1 transition rates for Ir^{17+}. Our results explain the lack of observations of the E1 transitions and provide a pathway toward the detection of clock transitions. The computational advances we demonstrate in this work are widely applicable to most elements in the periodic table and will allow us to solve numerous problems in atomic physics, astrophysics, and plasma physics.
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Affiliation(s)
- C Cheung
- Department of Physics and Astronomy, University of Delaware, Delaware 19716, USA
| | - M S Safronova
- Department of Physics and Astronomy, University of Delaware, Delaware 19716, USA
- Joint Quantum Institute, NIST and the University of Maryland, College Park, Maryland 20742, USA
| | - S G Porsev
- Department of Physics and Astronomy, University of Delaware, Delaware 19716, USA
- Petersburg Nuclear Physics Institute of NRC "Kurchatov Institute", Gatchina 188300, Russia
| | - M G Kozlov
- Petersburg Nuclear Physics Institute of NRC "Kurchatov Institute", Gatchina 188300, Russia
- St. Petersburg Electrotechnical University "LETI", Prof. Popov Street 5, St. Petersburg 197376, Russia
| | - I I Tupitsyn
- Department of Physics, St. Petersburg State University, Ulianovskaya 1, Petrodvorets, St. Petersburg 198504, Russia
- Center for Advanced Studies, Peter the Great St. Petersburg Polytechnic University, Polytekhnicheskaja 29, St. Petersburg 195251, Russia
| | - A I Bondarev
- Petersburg Nuclear Physics Institute of NRC "Kurchatov Institute", Gatchina 188300, Russia
- Center for Advanced Studies, Peter the Great St. Petersburg Polytechnic University, Polytekhnicheskaja 29, St. Petersburg 195251, Russia
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Cheung C, Talley KM, McMahon S, Schorr E, Wyman JF. Knowledge of Physical Activity Guidelines and Its Association with Physical Activity and Physical Function in Older Adults. Activities, Adaptation & Aging 2020. [DOI: 10.1080/01924788.2019.1591152] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- C. Cheung
- School of Nursing, University of Minnesota, Minneapolis, MN, USA
| | - K. M Talley
- School of Nursing, University of Minnesota, Minneapolis, MN, USA
| | - S. McMahon
- School of Nursing, University of Minnesota, Minneapolis, MN, USA
| | - E. Schorr
- School of Nursing, University of Minnesota, Minneapolis, MN, USA
| | - J. F. Wyman
- School of Nursing, University of Minnesota, Minneapolis, MN, USA
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Abstract
Compound freeform surfaces are widely used in bionic and optical applications. The manufacturing and measurement of such surfaces are challenging due to the complex geometry with multi-scale features in a high precision level with sub-micrometer form accuracy and nanometer surface finish. This article presents a study of ultra-precision machining and characterization of compound freeform surfaces. A hybrid machining process by combining slow slide servo and fast tool servo is proposed to machine compound freeform surfaces. The machining process for this hybrid tool servo is explained, and tool path generation is presented. Then, a normal template-based matching and characterization method is proposed to evaluate such compound freeform surfaces. Experimental studies are undertaken to machine a compound freeform surface using the proposed method based on a four-axis ultra-precision machine tool. The machined compound freeform surface is also measured and characterized by the proposed analysis and characterization method. The experimental results are presented, and the machining errors for compound freeform surfaces are also discussed.
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Affiliation(s)
- Lingbao Kong
- Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing, Fudan University, Shanghai, China
| | - Yingao Ma
- Shanghai United Instrument Component Co., Ltd, Shanghai, China
| | - Mingjun Ren
- State Key Laboratory of Mechanical System and Vibration, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Min Xu
- Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing, Fudan University, Shanghai, China
| | - Chifai Cheung
- Partner State Key Laboratory of Ultra-Precision Machining Technology, The Hong Kong Polytechnic University, Hong Kong, China
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Akhtar Ali S, Kang H, Olney R, Ramos-Platt L, Ryabets-Lienhard A, Cheung C, Georgia S, Pitukcheewanont P. Evaluating RANKL and OPG levels in patients with Duchenne muscular dystrophy. Osteoporos Int 2019; 30:2283-2288. [PMID: 31392399 DOI: 10.1007/s00198-019-05077-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Accepted: 06/26/2019] [Indexed: 11/29/2022]
Abstract
UNLABELLED RANKL-OPG should be explored in DMD patients to potentially provide targeted therapy. We quantified RANKL and OPG levels in DMD patients compared with controls. RANKL, OPG, and RANKL:OPG significantly declined with age in DMD patients suggesting some bone turnover markers are difficult to assess or use as therapeutic indicators. INTRODUCTION Osteoporosis in Duchenne muscular dystrophy (DMD) is multi-factorial in nature with high prevalence of fractures. RANKL-OPG should be explored to potentially provide targeted therapy for these patients. We quantified RANKL, OPG, and RANKL:OPG levels in DMD patients compared with controls and analyzed the influence of age, glucocorticoid use, ambulatory status, bone density, and fracture history. METHODS DMD patients were enrolled at CHLA. Controls were recruited from general pediatric clinic and in collaboration with samples from a previously completed study. Free soluble RANKL and OPG levels were quantified using a sandwich ELISA. RESULTS Fifty DMD patients and 50 controls were enrolled. DMD patients had a significant decline in RANKL, OPG, and RANKL:OPG with age (p = < 0.0001, p = 0.026, and p = 0.002, respectively) while healthy controls showed no significant change. RANKL trended lower in patients on glucocorticoids (p = 0.05), attributed to the significantly older age in the treatment group. RANKL and RANKL:OPG levels were significantly lower in the non-ambulatory group compared with the ambulatory group (p = 0.010 and 0.036 respectively), again likely due to their older age. There was no correlation of RANKL, OPG, or RANKL:OPG with DXA Z-score or presence of vertebral fractures. CONCLUSION There was significant decline in RANKL, OPG, and RANKL:OPG with age in DMD patients compared with controls, potentially due to disease severity or worsening osteoblastic function. This suggests some bone turnover markers may be difficult to assess or use as therapeutic indicators in DMD patients. Larger studies are needed to evaluate the role of RANKL-OPG in DMD patients to provide better targeted therapy.
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Affiliation(s)
- S Akhtar Ali
- Center for Endocrinology, Diabetes and Metabolism, Children's Hospital Los Angeles (CHLA), 4650 Sunset Blvd, # 61, Los Angeles, CA, 90027, USA.
| | - H Kang
- University of Southern California, Los Angeles, CA, USA
| | - R Olney
- Division of Endocrinology, Nemour Children's Hospital, Jacksonville, FL, USA
| | | | - A Ryabets-Lienhard
- Center for Endocrinology, Diabetes and Metabolism, Children's Hospital Los Angeles (CHLA), 4650 Sunset Blvd, # 61, Los Angeles, CA, 90027, USA
| | - C Cheung
- Center for Endocrinology, Diabetes and Metabolism, Children's Hospital Los Angeles (CHLA), 4650 Sunset Blvd, # 61, Los Angeles, CA, 90027, USA
| | - S Georgia
- Saban Research Institute, CHLA, Los Angeles, CA, USA
- Diabetes & Obesity Program, Center for Endocrinology, Diabetes and Metabolism, CHLA and Keck School of Medicine of USC, Los Angeles, CA, USA
| | - P Pitukcheewanont
- Center for Endocrinology, Diabetes and Metabolism, Children's Hospital Los Angeles (CHLA), 4650 Sunset Blvd, # 61, Los Angeles, CA, 90027, USA
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Steinberg C, Cheung C, Wan D, Staples J, Philippon F, Laksman Z, Sarrazin J, Bennett M, Plourde B, Deyell M, Andrade J, Roy K, Yeung-Lai-Wah J, Molin F, Hawkins N, Blier L, Nault I, O'Hara G, Krahn A, Champagne J, Chakrabarti S. DRIVING RESTRICTIONS AND EARLY ARRHYTHMIAS IN PATIENTS RECEIVING A PRIMARY PREVENTION IMPLANTABLE CARDIOVERTER-DEFIBRILLATOR (DREAM-ICD STUDY). Can J Cardiol 2019. [DOI: 10.1016/j.cjca.2019.07.570] [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: 10/25/2022] Open
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Cheung C, Bashir J, Laksman Z, Deyell M, Nouraei H, Yeung J, Bennett M, Andrade J, Krahn A, Chakrabarti S. CHANGES IN ELECTROGRAM AMPLITUDE AND INAPPROPRIATE SHOCKS IN PATIENTS WITH SUBCUTANEOUS IMPLANTABLE CARDIOVERTER-DEFIBRILLATORS. Can J Cardiol 2019. [DOI: 10.1016/j.cjca.2019.07.407] [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: 11/29/2022] Open
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Schwock J, Ko H, Weiss J, Cheung C, Boerner S, Tsao M. P3.09-26 Concordance of Surgical Resections and Fine Needle Biopsy-Derived Cell Block Sections for PD-L1 22C3 Immunohistochemistry. J Thorac Oncol 2018. [DOI: 10.1016/j.jtho.2018.08.1795] [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: 10/28/2022]
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Cheung C, Deyell M, Laksman Z, Yeung J, Andrade J, Bennett M, Hawkins N, Krahn A, Chakrabarti S. ATRIAL ARRHYTHMIAS AND INAPPROPRIATE DEFIBRILLATOR THERAPY: YOU HAVE BEEN WARNED! Can J Cardiol 2018. [DOI: 10.1016/j.cjca.2018.07.114] [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] Open
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25
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Yao R, Hawkins N, Deyell M, Cheung C, Fordyce C, Wong G, Macle L, Andrade J. ANTITHROMBOTIC THERAPIES FOR PATIENTS WITH AN INDICATION FOR ANTICOAGULATION AND STABLE CORONARY ARTERY DISEASE: A NETWORK META-ANALYSIS. Can J Cardiol 2018. [DOI: 10.1016/j.cjca.2018.07.162] [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: 11/27/2022] Open
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26
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Cheung C, Laksman Z, Roberts J, Green M, Healey J, Sanatani S, Arbour L, Leather R, Chauhan V, Steinberg C, Angaran P, Duff H, Chakrabarti S, Simpson C, Talajic M, Tadros R, Seifer C, Gardner M, Krahn A. ARRHYTHMIC OUTCOMES IN CARDIAC ARREST SURVIVORS WITH PRESERVED EJECTION FRACTION REGISTRY (CASPER). Can J Cardiol 2018. [DOI: 10.1016/j.cjca.2018.07.296] [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: 10/28/2022] Open
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Wang S, Cheung C, Ren M, Liu M. Fiducial-aided on-machine positioning method for precision manufacturing of optical freeform surfaces. Opt Express 2018; 26:18928-18943. [PMID: 30114152 DOI: 10.1364/oe.26.018928] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Accepted: 07/01/2018] [Indexed: 06/08/2023]
Abstract
There are still significant challenges in the accurate positioning of optical freeform surfaces on the machine tool and the measurement instrument due to the high accuracy requirement and their complex shapes. This paper proposes a Fiducial-aided On-machine Positioning method (FAOPM) that combines on-machine measurement and off-machine measurement to precisely position optical freeform surfaces during the precision manufacturing cycle including rough machining, fine machining, measurement, and error compensation. The FAOPM makes use of fiducials which are firstly measured on a coordinate measuring machine with nanometric accuracy to generate a Fiducial-aided Computer Aided Design (FA-CAD) of the designed optical surface, then the developed on-machine measuring device obtains the accurate positions of the fiducials after remounting in the machining coordinate system. Finally the relative position of the workpiece is identified so that the associated cutting paths and compensation tool path can be easily generated. Several optical freeform surfaces were experimentally machined to prove the capability of the proposed method. The results indicate that the positions of the workpiece during the precision manufacturing and measurement cycle were precisely achieved and the form accuracy of the optical freeform surfaces was remarkable improved based on the FAOPM.
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James SN, Rommel AS, Cheung C, McLoughlin G, Brandeis D, Banaschewski T, Asherson P, Kuntsi J. Association of preterm birth with ADHD-like cognitive impairments and additional subtle impairments in attention and arousal malleability. Psychol Med 2018; 48:1484-1493. [PMID: 29094658 PMCID: PMC6088527 DOI: 10.1017/s0033291717002963] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Revised: 09/08/2017] [Accepted: 09/08/2017] [Indexed: 12/23/2022]
Abstract
BACKGROUND Whilst preterm-born individuals have an increased risk of developing attention-deficit/hyperactivity disorder (ADHD), and are reported to have ADHD-like attention and arousal impairments, direct group comparisons are scarce. METHODS We directly compared preterm-born adolescents (n = 186) to term-born adolescents with ADHD (n = 69), and term-born controls (n = 135), aged 11-23, on cognitive-performance, event-related potential and skin conductance level (SCL) measures associated with attention and arousal. The measures are from baseline and fast-incentive conditions of a four-choice reaction time task, previously shown to discriminate between the individuals with ADHD and controls. We aimed to establish whether preterm-born adolescents show: (a) identical cognitive-neurophysiological impairments to term-born adolescents with ADHD (b) possible additional impairments, and whether (c) the observed impairments correlate with ADHD symptom scores. RESULTS The preterm group, like the term-born ADHD group, showed increased mean reaction time (MRT) and reaction time variability (RTV) in the baseline condition, and attenuated contingent negative variation (CNV) amplitude (response preparation) in the fast-incentive condition. The preterm group, only, did not show significant within-group adjustments in P3 amplitude (attention allocation) and SCL (peripheral arousal). Dimensional analyses showed that ADHD symptoms scores correlated significantly with MRT, RTV and CNV amplitude only. CONCLUSIONS We find impairments in cognition and brain function in preterm-born adolescents that are linked to increased ADHD symptoms, as well as further impairments, in lack of malleability in neurophysiological processes. Our findings indicate that such impairments extend at least to adolescence. Future studies should extend these investigations into adulthood.
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Affiliation(s)
- S.-N. James
- King's College London, MRC Social, Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, Psychology and Neuroscience, London, UK
- MRC Lifelong Health and Ageing Unit at University College London, London, UK
| | - A.-S. Rommel
- King's College London, MRC Social, Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, Psychology and Neuroscience, London, UK
| | - C. Cheung
- King's College London, MRC Social, Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, Psychology and Neuroscience, London, UK
| | - G. McLoughlin
- King's College London, MRC Social, Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, Psychology and Neuroscience, London, UK
| | - D. Brandeis
- Department of Child and Adolescent Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim/Heidelberg University, Mannheim, Germany
- Department of Child and Adolescent Psychiatry and Psychotherapy, Psychiatric Hospital, University of Zurich, Zurich, Switzerland
- Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland
- Neuroscience Center Zurich, University of Zurich, Zurich, Switzerland
| | - T. Banaschewski
- Department of Child and Adolescent Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim/Heidelberg University, Mannheim, Germany
| | - P. Asherson
- King's College London, MRC Social, Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, Psychology and Neuroscience, London, UK
| | - J. Kuntsi
- King's College London, MRC Social, Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, Psychology and Neuroscience, London, UK
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Cheung C, Wu KX, Pek N, Narmada BC, Chioh F, Heng CK, Chan MYY. P175Understanding genetic basis of coronary artery disease using personalised vascular model. Cardiovasc Res 2018. [DOI: 10.1093/cvr/cvy060.132] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- C Cheung
- Nanyang Technological University, Lee Kong Chian School of Medicine, Singapore, Singapore
| | - K X Wu
- Nanyang Technological University, Lee Kong Chian School of Medicine, Singapore, Singapore
| | - N Pek
- Agency for Science, Technology and Research, Institute of Molecular and Cell Biology, Singapore, Singapore
| | - B C Narmada
- Agency for Science, Technology and Research, Institute of Molecular and Cell Biology, Singapore, Singapore
| | - F Chioh
- Nanyang Technological University, Lee Kong Chian School of Medicine, Singapore, Singapore
| | - C K Heng
- National University of Singapore, Singapore, Singapore
| | - MYY Chan
- National University of Singapore, Singapore, Singapore
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Zhao C, Cheung C, Liu M. Integrated polar microstructure and template-matching method for optical position measurement. Opt Express 2018; 26:4330-4345. [PMID: 29475284 DOI: 10.1364/oe.26.004330] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Accepted: 02/02/2018] [Indexed: 06/08/2023]
Abstract
This paper presents an integrated polar microstructure and template-matching method for optical position measurement that is developed based on the technology of ultra-precision machining (UPM) and computer vision. For computer vision, this paper makes use of the template-matching method as the basic working principle to match the position on the surface. For UPM, an optical microstructure that is named a 'polar microstructure' is purposely designed and fabricated by ultra-precision diamond machining technology to provide the high resolution of the position measurement. To demonstrate the performance of the proposed method for optical position measurement, a high-precision multi-sensor coordinate measuring machine was used to test the position accuracy and the length uncertainty for the two axes of this positioning method. The experimental results show that the average length uncertainty and the corresponding standard deviation errors are 109.6 nm and 76.4 nm on the X-axis, and 91.8 nm and 69.7 nm on the Y-axis, respectively.
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Reay C, Cheung C, Lanka S, Little S, Ryanna K, Agrawal S, Panchal R, Bennett J, Tufail M. Use of a discharge lounge to facilitate ambulatory CT guided percutaneous lung biopsies for suspected lung cancer – an effective and cost effective pathway with high patient satisfaction. Lung Cancer 2018. [DOI: 10.1016/s0169-5002(18)30057-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Chiu SLH, Lam FM, Cheung C. Admission Gatekeeping and Safe Discharge for the Elderly: Referral by the Emergency Department to the Community Nursing Service for Home Visits. HONG KONG J EMERG ME 2017. [DOI: 10.1177/102490790701400203] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Objective To assess the gatekeeping effect and discharge safety in elderly referrals to the community nursing service (CNS) in a major accident & emergency department (AED). Methods Descriptive review analysis of the referrals in 2002–2004. Results Altogether 333 patients were accepted, comprising 5% of the total CNS referrals in the hospital: 323 were aged ≥65 (median age 81), 13.8% were living alone, 21.6% had unscheduled return to the AED within 14 days, and 11.7% in 15–28 days. The ≤14 days and 15–28 days admission to hospital was 15.0% and 6.0%, with 4.8% and 0.6% patients admitted with the same or related diagnosis as the first visit respectively, including missed fractures and stroke. One patient died 17 days after discharge. Eight of the 162 falls returned within 28 days with a second fall. Overall, 317 admissions were avoided with 1,978 bed-days saved. Living alone was strongly associated with unscheduled return and admission ≤14 and ≤28 days, while age was not. The six categories of community nursing care were fall-related, tube care, skin and soft tissue care, pain control, medical and diabetic care. Injections were given for cellulitis, pain, and diabetics. Forty-nine patients had phone follow-ups. Conclusion The gatekeeping effect of AED referrals to CNS remained small. The commonest referrals were falls with head injury. It was safe to discharge the elderly for CNS care. A wide range of home nursing care was feasible. CNS referral could decrease elderly return visits with falls. Living alone was strongly associated with return visit and admission.
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Woolcock AD, Keenan A, Cheung C, Christian JA, Moore GE. Thrombocytosis in 715 Dogs (2011-2015). J Vet Intern Med 2017; 31:1691-1699. [PMID: 28895208 PMCID: PMC5697177 DOI: 10.1111/jvim.14831] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 06/13/2017] [Accepted: 08/15/2017] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Thrombocytosis is a hematologic abnormality in dogs that has been associated with various neoplastic, metabolic, and inflammatory conditions. OBJECTIVE To classify thrombocytosis in dogs based on severity and evaluate whether there are associations between severity and underlying disease processes. ANIMALS Seven hundred and fifteen dogs with thrombocytosis and 1,430 dogs with normal numbers of platelets. METHODS Retrospective study. Medical records of dogs with increased (>500 × 103 /μL; thrombocytosis group) and normal (300-500 × 103 /μL; control group) platelet counts between 2011 and 2015 were reviewed. Dogs were characterized by severity of platelet increase and diagnosis. Diagnostic categories included neoplasia, endocrine disease, inflammatory disease, or miscellaneous. RESULTS A total of 1,254 complete blood counts with thrombocytosis from 715 dogs were included in the study. Median platelet count in this population was 582 × 103 /μL (500-1,810 × 103 /μL). No correlation between severity of thrombocytosis and diagnosis was identified. Causes of secondary thrombocytosis included neoplasia (55.7%), endocrine disease (12.0%), and inflammatory disease (46.6%). Immune-mediated disease was common (22.2%), associated with frequent glucocorticoid administration, and had a significantly higher median platelet count (636 × 103 /μL [500-1,262 × 103 /μL] versus 565 × 103 /μL [500-1,810 × 103 /μL]) when compared to the other inflammatory processes (P < 0.001). The diagnoses in the thrombocytosis dogs differed significantly from the control population (P < 0.001). CONCLUSIONS AND CLINICAL IMPORTANCE Thrombocytosis is commonly associated with carcinoma and immune-mediated disease in dogs.
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Affiliation(s)
- A D Woolcock
- Department of Veterinary Clinical Sciences, Purdue University, West Lafayette, IN
| | - A Keenan
- Department of Veterinary Clinical Sciences, Purdue University, West Lafayette, IN
| | - C Cheung
- Department of Veterinary Clinical Sciences, Purdue University, West Lafayette, IN
| | - J A Christian
- Department of Comparative Pathobiology, Purdue University, West Lafayette, IN
| | - G E Moore
- Department of Veterinary Administration, College of Veterinary Medicine, Purdue University, West Lafayette, IN
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Cheung B, Tam F, Cheung C, Lee S, Tsui S, Chan E. Serum Beta-2 Microglobulin Level is Elevated in Patients with Acute Coronary Syndrome. Clin Ther 2017. [DOI: 10.1016/j.clinthera.2017.05.162] [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: 10/19/2022]
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Cheung C, Wan D, Grunau B, Taylor C, Deyell M, Fordyce C, Wenner J, Kiamanesh O, Kaila K, Christenson J, Farkouh M, Ramanathan K. P2749Is relying on ST depression to help predict coronary artery disease after an out-of-hospital cardiac arrest harming patients? Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx502.p2749] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Mellor G, Cheung C, Steinberg C, Lane C, Lemaitre J, Bennett M, Chakrabarti S, Krahn A, Bashir J. THE BRITISH COLUMBIA PROVINCIAL EXPERIENCE WITH A TOTALLY SUBCUTANEOUS IMPLANTABLE DEFIBRILLATOR: A RETROSPECTIVE COHORT STUDY. Can J Cardiol 2016. [DOI: 10.1016/j.cjca.2016.07.469] [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: 10/20/2022] Open
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Dang E, Man G, Lee D, Cheung C, Elias P, Man M. 311 Inducible nitric oxide synthase is crucial for epidermal permeability barrier homeostasis. J Invest Dermatol 2016. [DOI: 10.1016/j.jid.2016.02.342] [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: 10/21/2022]
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Cadman T, Findon J, Eklund H, Hayward H, Howley D, Cheung C, Kuntsi J, Glaser K, Murphy D, Asherson P. Six-year follow-up study of combined type ADHD from childhood to young adulthood: Predictors of functional impairment and comorbid symptoms. Eur Psychiatry 2016; 35:47-54. [PMID: 27077377 DOI: 10.1016/j.eurpsy.2015.08.007] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [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: 07/02/2015] [Revised: 08/26/2015] [Accepted: 08/28/2015] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND ADHD in childhood is associated with development of negative psychosocial and behavioural outcomes in adults. Yet, relatively little is known about which childhood and adulthood factors are predictive of these outcomes and could be targets for effective interventions. To date follow-up studies have largely used clinical samples from the United States with children ascertained at baseline using broad criteria for ADHD including all clinical subtypes or the use of DSM III criteria. AIMS To identify child and adult predictors of comorbid and psychosocial comorbid outcomes in ADHD in a UK sample of children with DSM-IV combined type ADHD. METHOD One hundred and eighteen adolescents and young adults diagnosed with DSM-IV combined type ADHD in childhood were followed for an average of 6years. Comorbid mental health problems, drug and alcohol use and police contact were compared for those with persistent ADHD, sub-threshold ADHD and population norms taken from the Adult Psychiatric Morbidity Study 2007. Predictors included ADHD symptomology and gender. RESULTS Persistent ADHD was associated with greater levels of anger, fatigue, sleep problems and anxiety compared to sub-threshold ADHD. Comorbid mental health problems were predicted by current symptoms of hyperactivity-impulsivity, but not by childhood ADHD severity. Both persistent and sub-threshold ADHD was associated with higher levels of drug use and police contact compared to population norms. CONCLUSIONS Young adults with a childhood diagnosis of ADHD showed increased rates of comorbid mental health problems, which were predicted by current levels of ADHD symptoms. This suggests the importance of the continuing treatment of ADHD throughout the transitional years and into adulthood. Drug use and police contact were more common in ADHD but were not predicted by ADHD severity in this sample.
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Affiliation(s)
- T Cadman
- Sackler Institute for Translational Neurodevelopment and Department of Forensic and Neurodevelopmental Sciences, King's College London, Institute of Psychiatry, Psychology & Neuroscience, London, UK.
| | - J Findon
- Sackler Institute for Translational Neurodevelopment and Department of Forensic and Neurodevelopmental Sciences, King's College London, Institute of Psychiatry, Psychology & Neuroscience, London, UK
| | - H Eklund
- Sackler Institute for Translational Neurodevelopment and Department of Forensic and Neurodevelopmental Sciences, King's College London, Institute of Psychiatry, Psychology & Neuroscience, London, UK
| | - H Hayward
- Sackler Institute for Translational Neurodevelopment and Department of Forensic and Neurodevelopmental Sciences, King's College London, Institute of Psychiatry, Psychology & Neuroscience, London, UK
| | - D Howley
- Sackler Institute for Translational Neurodevelopment and Department of Forensic and Neurodevelopmental Sciences, King's College London, Institute of Psychiatry, Psychology & Neuroscience, London, UK
| | - C Cheung
- King's College London, MRC Social, Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, Psychology and Neuroscience, London, UK
| | - J Kuntsi
- King's College London, MRC Social, Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, Psychology and Neuroscience, London, UK
| | - K Glaser
- Department of Social Science, Health and Medicine, King's College London, London, UK
| | - D Murphy
- Sackler Institute for Translational Neurodevelopment and Department of Forensic and Neurodevelopmental Sciences, King's College London, Institute of Psychiatry, Psychology & Neuroscience, London, UK
| | - P Asherson
- King's College London, MRC Social, Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, Psychology and Neuroscience, London, UK
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So P, Steinberg C, Cheung C, Champagne J, Sanatani S, Angaran P, Chakrabarti S, Healey J, Chauhan V, Birnie D, Janzen M, Gerull B, Yee R, Bennett M, Leather R, Gollob M, Simpson C, Talajic M, Gardner M, Krahn A. EARLY REPOLARIZATION INHERITANCE PATTERN IN CARDIAC ARREST SURVIVORS WITH PRESERVED EJECTION FRACTION REGISTRY (CASPER). Can J Cardiol 2015. [DOI: 10.1016/j.cjca.2015.07.263] [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: 11/15/2022] Open
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Herman A, Cheung C, Janzen M, Bennett M, Chakrabarti S, Gibbs K, Healey J, Chauhan V, Birnie D, Champagne J, Sanatani S, Angaran P, Gow R, Gerull B, Leather R, Klein G, Gollob M, Talajic M, Simpson C, Gardner M, Krahn A. INFLUENCE OF ASSIGNING A DIAGNOSIS ON ARRHYTHMIA RECURRENCE IN APPARENTLY UNEXPLAINED CARDIAC ARREST PATIENTS (CASPER). Can J Cardiol 2015. [DOI: 10.1016/j.cjca.2015.07.262] [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: 10/22/2022] Open
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Lien YH, Lai LW, Cheung C, Patterson D, Chan L. Role of purine synthesis on renal function: effect of adenylosuccinate synthetase inhibition. Contrib Nephrol 2015; 95:112-9. [PMID: 1807901 DOI: 10.1159/000420647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Y H Lien
- Department of Medicine, University of Colorado Health Sciences Center, Denver
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Cochrane A, Imam S, Hiramanek R, Cheung C, Rangan K, Castillo E, Freyer D, Dhall G, Finlay J. CN-03 * LONG-TERM FOLLOW-UP OF ENDOCRINE FUNCTION AMONG YOUNG CHILDREN WITH NEWLY-DIAGNOSED MALIGNANT CENTRAL NERVOUS SYSTEM (CNS) TUMORS TREATED WITH IRRADIATION-AVOIDING REGIMENS: THE CHILDREN'S HOSPITAL LOS ANGELES (CHLA) EXPERIENCE. Neuro Oncol 2014; 16:v46-v46. [PMCID: PMC4218017 DOI: 10.1093/neuonc/nou243.3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2023] Open
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Steinberg C, Padfield G, Swampillai J, Cheung C, Yeung-Lai-Wah J, Chua D, Kerr C, Chakrabarti S, Tung S, Andrade J, Bennett M, Krahn A, Deyell M. ORAL PROCAINAMIDE IN PATIENTS WITH STRUCTURAL HEART DISEASE AND REFRACTORY VENTRICULAR TACHYCARDIA. Can J Cardiol 2014. [DOI: 10.1016/j.cjca.2014.07.739] [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: 10/24/2022] Open
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Letton C, Cheung C, Nordin A. Does an enhanced recovery integrated care pathway (ICP) encourage adherence to prescribing guidelines, accelerate postoperative recovery and reduce the length of stay for gynaecological oncology patients? J OBSTET GYNAECOL 2014; 33:296-7. [PMID: 23550863 DOI: 10.3109/01443615.2012.758693] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
A new integrated care pathway (ICP) proforma for gynaecological oncology patients was developed and introduced in early 2010. The ICP is a goal-defined and time-specified documentation by gynaecological oncology doctors and nurses, guided by certain parameters to be achieved in pre and postoperative days. All patients were admitted to the same unit and underwent a major abdominal/pelvic procedure for confirmed or suspected gynaecological malignancy, including hysterectomy and oophorectomy. The control group included 58 randomly selected patients from May 2008 to March 2009 and the intervention group comprised 52 patients, after the introduction of the ICP. The effectiveness was assessed with a variety of measurements: the duration of intraperitoneal drains, urethral catheters and intravenous fluids postoperatively; time taken for the patient to eat and drink; time taken to mobilisation; and the total length of stay in hospital. We also assessed whether the implementation of the care pathway was associated with an increase in adherence to prescribing guidelines for thromboprophylaxis and postoperative antibiotics and sodium docusate. The new ICP encouraged clearer documentation and regular review of fluids, drains and catheters. There was a modest reduction in the length of stay and an increase in prescribed thromboprophylaxis and sodium docusate ( Cheung et al. 2011 ).
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Affiliation(s)
- C Letton
- Department of Women's Health, East Kent Gynaecological Oncology Centre, Queen Elizabeth The Queen Mother Hospital, East Kent University Hospital NHS Foundation Trust, Greenwich, London, UK
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Kelly ME, Leonard M, Green C, Beggs R, Cheung C, McElwain J, Morris S. Should money follow the patient: Financial implication for being the National Centre for the Treatment and Management of Pelvic and Acetabular Fractures in Ireland. Injury 2013; 44:1816-9. [PMID: 23490321 DOI: 10.1016/j.injury.2013.02.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [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: 09/17/2012] [Revised: 12/04/2012] [Accepted: 02/09/2013] [Indexed: 02/02/2023]
Abstract
BACKGROUND Pelvic and acetabular fractures are complex injuries requiring specialist treatment. Our institution is the National Centre for Treatment and Management of these injuries. AIM To audit all referrals to our institution over a 6-month period and calculate the cost incurred by being the national referral centre. METHODS Retrospective review of database, and subsequent allocation of Casemix points to assess total cost of treatment for each patient referred to our institution. RESULTS 103 patients referred with pelvic or acetabular fracture for operative management. The furthest referral distance was 181miles. Over-all, the length of stay was 15.4 days. The average inclusive cost for a referral to our unit for operative management was €16,302. CONCLUSION Pelvic and acetabular fractures are complex injuries that require specialist referral unit management. However for these units to remain sustainable money needs to "follow the patient".
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Affiliation(s)
- M E Kelly
- National Centre for Pelvic & Acetabular Surgery, The Adelaide and Meath Hospital, Dublin, Incorporating the National Children's Hospital, Dublin, Ireland.
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Wang Q, Cheung C, Deng W, Li M, Huang C, Ma X, Wang Y, Jiang L, Sham PC, Collier DA, Gong Q, Chua SE, McAlonan GM, Li T. White-matter microstructure in previously drug-naive patients with schizophrenia after 6 weeks of treatment. Psychol Med 2013; 43:2301-2309. [PMID: 23442742 DOI: 10.1017/s0033291713000238] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
BACKGROUND It is not clear whether the progressive changes in brain microstructural deficits documented in previous longitudinal magnetic resonance imaging (MRI) studies might be due to the disease process or to other factors such as medication. It is important to explore the longitudinal alterations in white-matter (WM) microstructure in antipsychotic-naive patients with first-episode schizophrenia during the very early phase of treatment when relatively 'free' from chronicity. METHOD Thirty-five patients with first-episode schizophrenia and 22 healthy volunteers were recruited. High-resolution diffusion tensor imaging (DTI) was obtained from participants at baseline and after 6 weeks of treatment. A 'difference map' for each individual was calculated from the 6-week follow-up fractional anisotropy (FA) of DTI minus the baseline FA. Differences in Positive and Negative Syndrome Scale (PANSS) scores and Global Assessment of Functioning (GAF) scores between baseline and 6 weeks were also evaluated and expressed as a 6-week/baseline ratio. RESULTS Compared to healthy controls, there was a significant decrease in absolute FA of WM around the bilateral anterior cingulate gyrus and the right anterior corona radiata of the frontal lobe in first-episode drug-naive patients with schizophrenia following 6 weeks of treatment. Clinical symptoms improved during this period but the change in FA did not correlate with the changes in clinical symptoms or the dose of antipsychotic medication. CONCLUSIONS During the early phase of treatment, there is an acute reduction in WM FA that may be due to the effects of antipsychotic medications. However, it is not possible to entirely exclude the effects of underlying progression of illness.
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Affiliation(s)
- Q Wang
- Mental Health Centre and Psychiatric Laboratory, West China Hospital, Sichuan University, Chengdu, Sichuan, China
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Wang Q, Cheung C, Deng W, Li M, Huang C, Ma X, Wang Y, Jiang L, McAlonan G, Sham P, Collier DA, Gong Q, Chua SE, Li T. Fronto-parietal white matter microstructural deficits are linked to performance IQ in a first-episode schizophrenia Han Chinese sample. Psychol Med 2013; 43:2047-2056. [PMID: 23237024 DOI: 10.1017/s0033291712002905] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
BACKGROUND Evidence shows that cognitive deficits and white matter (WM) dysconnectivity can independently be associated with clinical manifestations in schizophrenia. It is important to explore this triadic relationship in order to investigate whether the triplet could serve as potential extended endophenotypes of schizophrenia. METHOD Diffusion tensor images and clinical performances were evaluated in 122 individuals with first-episode schizophrenia and 122 age- and gender-matched controls. In addition, 65 of 122 of the patient group and 40 of 122 controls were measured using intelligence quotient (IQ) testing. RESULTS The schizophrenia group showed lower fractional anisotropy (FA) values than controls in the right cerebral frontal lobar sub-gyral (RFSG) WM. The schizophrenia group also showed a significant positive correlation between FA in the RFSG and performance IQ (PIQ) ; in turn, their PIQ score showed a significant negative correlation with negative syndromes. CONCLUSIONS Overall, these findings support the hypothesis that WM deficits may be a core deficit that contributes to cognitive deficits as well as to negative symptoms.
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Affiliation(s)
- Q Wang
- The Mental Health Center and Psychiatric Laboratory, West China Hospital, Sichuan University, Chengdu, Sichuan, People's Republic of China
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Low L, Cheung C, Bennett M, Sinha S. 211 LINEAGE-DEPENDENT DIFFERENCES BETWEEN HUMAN SMOOTH MUSCLE CELLS IN ABILITY TO SUPPORT VASCULOGENESIS. Heart 2013. [DOI: 10.1136/heartjnl-2013-304019.211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Cornell P, Trehane A, Thompson P, Rahmeh F, Greenwood M, Baqai TJ, Cambridge S, Shaikh M, Rooney M, Donnelly S, Tahir H, Ryan S, Kamath S, Hassell A, McCuish WJ, Bearne L, Mackenzie-Green B, Price E, Williamson L, Collins D, Tang E, Hayes J, McLoughlin YM, Chamberlain V, Campbell S, Shah P, McKenna F, Cornell P, Westlake S, Thompson P, Richards S, Homer D, Gould E, Empson B, Kemp P, Richards AG, Walker J, Taylor S, Bari SF, Alachkar M, Rajak R, Lawson T, O'Sullivan M, Samant S, Butt S, Gadsby K, Flurey CA, Morris M, Hughes R, Pollock J, Richards P, Hewlett S, Edwards KR, Rowe I, Sanders T, Dunn K, Konstantinou K, Hay E, Jones LE, Adams J, White P, Donovan-Hall M, Hislop K, Barbosa Boucas S, Nichols VP, Williamson EM, Toye F, Lamb SE, Rodham K, Gavin J, Watts L, Coulson N, Diver C, Avis M, Gupta A, Ryan SJ, Stangroom S, Pearce JM, Byrne J, Manning VL, Hurley M, Scott DL, Choy E, Bearne L, Taylor J, Morris M, Dures E, Hewlett S, Wilson A, Adams J, Larkin L, Kennedy N, Gallagher S, Fraser AD, Shrestha P, Batley M, Koduri G, Scott DL, Flurey CA, Morris M, Hughes R, Pollock J, Richards P, Hewlett S, Kumar K, Raza K, Nightingale P, Horne R, Chapman S, Greenfield S, Gill P, Ferguson AM, Ibrahim F, Scott DL, Lempp H, Tierney M, Fraser A, Kennedy N, Barbosa Boucas S, Hislop K, Dziedzic K, Arden N, Burridge J, Hammond A, Stokes M, Lewis M, Gooberman-Hill R, Coales K, Adams J, Nutland H, Dean A, Laxminarayan R, Gates L, Bowen C, Arden N, Hermsen L, Terwee CB, Leone SS, vd Zwaard B, Smalbrugge M, Dekker J, vd Horst H, Wilkie R, Ferguson AM, Nicky Thomas V, Lempp H, Cope A, Scott DL, Simpson C, Weinman J, Agarwal S, Kirkham B, Patel A, Ibrahim F, Barn R, Brandon M, Rafferty D, Sturrock R, Turner D, Woodburn J, Rafferty D, Paul L, Marshall R, Gill J, McInnes I, Roderick Porter D, Woodburn J, Hennessy K, Woodburn J, Steultjens M, Siddle HJ, Hodgson RJ, Hensor EM, Grainger AJ, Redmond A, Wakefield RJ, Helliwell PS, Hammond A, Rayner J, Law RJ, Breslin A, Kraus A, Maddison P, Thom JM, Newcombe LW, Woodburn J, Porter D, Saunders S, McCarey D, Gupta M, Turner D, McGavin L, Freeburn R, Crilly A, Lockhart JC, Ferrell WR, Goodyear C, Ledingham J, Waterman T, Berkin L, Nicolaou M, Watson P, Lillicrap M, Birrell F, Mooney J, Merkel PA, Poland F, Spalding N, Grayson P, Leduc R, Shereff D, Richesson R, Watts RA, Roussou E, Thapper M, Bateman J, Allen M, Kidd J, Parsons N, Davies D, Watt KA, Scally MD, Bosworth A, Wilkinson K, Collins S, Jacklin CB, Ball SK, Grosart R, Marks J, Litwic AE, Sriranganathan MK, Mukherjee S, Khurshid MA, Matthews SM, Hall A, Sheeran T, Baskar S, Muether M, Mackenzie-Green B, Hetherington A, Wickrematilake G, Williamson L, Daniels LE, Gwynne CE, Khan A, Lawson T, Clunie G, Stephenson S, Gaffney K, Belsey J, Harvey NC, Clarke-Harris R, Murray R, Costello P, Garrett E, Holbrook J, Teh AL, Wong J, Dogra S, Barton S, Davies L, Inskip H, Hanson M, Gluckman P, Cooper C, Godfrey K, Lillycrop K, Anderton T, Clarke S, Rao Chaganti S, Viner N, Seymour R, Edwards MH, Parsons C, Ward K, Thompson J, Prentice A, Dennison E, Cooper C, Clark E, Cumming M, Morrison L, Gould VC, Tobias J, Holroyd CR, Winder N, Osmond C, Fall C, Barker D, Ring S, Lawlor D, Tobias J, Davey Smith G, Cooper C, Harvey NC, Toms TE, Afreedi S, Salt K, Roskell S, Passey K, Price T, Venkatachalam S, Sheeran T, Davies R, Southwood TR, Kearsley-Fleet L, Hyrich KL, Kingsbury D, Quartier P, Patel G, Arora V, Kupper H, Mozaffarian N, Kearsley-Fleet L, Baildam E, Beresford MW, Davies R, Foster HE, Mowbray K, Southwood TR, Thomson W, Hyrich KL, Saunders E, Baildam E, Chieng A, Davidson J, Foster H, Gardner-Medwin J, Wedderburn L, Thomson W, Hyrich K, McErlane F, Beresford M, Baildam E, Chieng SE, Davidson J, Foster HE, Gardner-Medwin J, Lunt M, Wedderburn L, Thomson W, Hyrich K, Rooney M, Finnegan S, Gibson DS, Borg FA, Bale PJ, Armon K, Cavelle A, Foster HE, McDonagh J, Bale PJ, Armon K, Wu Q, Pesenacker AM, Stansfield A, King D, Barge D, Abinun M, Foster HE, Wedderburn L, Stanley K, Morrissey D, Parsons S, Kuttikat A, Shenker N, Garrood T, Medley S, Ferguson AM, Keeling D, Duffort P, Irving K, Goulston L, Culliford D, Coakley P, Taylor P, Hart D, Spector T, Hakim A, Arden N, Mian A, Garrood T, Magan T, Chaudhary M, Lazic S, Sofat N, Thomas MJ, Moore A, Roddy E, Peat G, Rees F, Lanyon P, Jordan N, Chaib A, Sangle S, Tungekar F, Sabharwal T, Abbs I, Khamashta M, D'Cruz D, Dzifa Dey I, Isenberg DA, Chin CW, Cheung C, Ng M, Gao F, Qiong Huang F, Thao Le T, Yong Fong K, San Tan R, Yin Wong T, Julian T, Parker B, Al-Husain A, Yvonne Alexander M, Bruce I, Jordan N, Abbs I, D'cruz D, McDonald G, Miguel L, Hall C, Isenberg DA, Magee A, Butters T, Jury E, Yee CS, Toescu V, Hickman R, Leung MH, Situnayake D, Bowman S, Gordon C, Yee CS, Toescu V, Hickman R, Leung MH, Situnayake D, Bowman S, Gordon C, Lazarus MN, Isenberg DA, Ehrenstein M, Carter LM, Isenberg DA, Ehrenstein MR, Chanchlani N, Gayed M, Yee CS, Gordon C, Ball E, Rooney M, Bell A, Reynolds JA, Ray DW, O'Neill T, Alexander Y, Bruce I, Sutton EJ, Watson KD, Isenberg D, Rahman A, Gordon C, Yee CS, Lanyon P, Jayne D, Akil M, D'Cruz D, Khamashta M, Lutalo P, Erb N, Prabu A, Edwards CJ, Youssef H, McHugh N, Vital E, Amft N, Griffiths B, Teh LS, Zoma A, Bruce I, Durrani M, Jordan N, Sangle S, D'Cruz D, Pericleous C, Ruiz-Limon P, Romay-Penabad Z, Carrera-Marin A, Garza-Garcia A, Murfitt L, Driscoll PC, Giles IP, Ioannou Y, Rahman A, Pierangeli SS, Ripoll VM, Lambrianides A, Heywood WE, Ioannou J, Giles IP, Rahman A, Stevens C, Dures E, Morris M, Knowles S, Hewlett S, Marshall R, Reddy V, Croca S, Gerona D, De La Torre Ortega I, Isenberg DA, Leandro M, Cambridge G, Reddy V, Cambridge G, Isenberg DA, Glennie M, Cragg M, Leandro M, Croca SC, Isenberg DA, Giles I, Ioannou Y, Rahman A, Croca SC, Isenberg DA, Giles I, Ioannou Y, Rahman A, Artim Esen B, Pericleous C, MacKie I, Ioannou Y, Rahman A, Isenberg DA, Giles I, Skeoch S, Haque S, Pemberton P, Bruce I. BHPR: Audit and Clinical Evaluation * 103. Dental Health in Children and Young Adults with Inflammatory Arthritis: Access to Dental Care. Rheumatology (Oxford) 2013. [DOI: 10.1093/rheumatology/ket196] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Bayley PJ, Isaac L, Kong JY, Adamson MM, Ashford JW, Mahoney LA, Beltran M, Brown-Elhillali A, Held A, Ajayi A, Belcher H, Bond A, Mason H, Lemaster C, Shaw S, Mullin C, Holick E, Saper R, Braun TD, Riley KE, Park CL, Trehern AE, Davis MB, Mastronardi EL, Butzer B, Khalsa SBS, Shorter SM, Reinhardt KM, Cope S, Cheung C, Justice C, Wyman J, Cook-Cottone CP, Daly LA, Haden SC, Hagins M, Danhauer SC, Griffin LP, Avis NE, Sohl SJ, Lawrence J, Jesse MT, Addington EL, Messino MJ, Giguere JK, Lucas SL, Wiliford SK, Shaw E, de Manincor M, Bensoussan A, Smith C, Fahey P, Bourchier S, Desrochers DIM, Viswanathan S, Partharasathy BR, Doherty K, Moye J, Walsh C, Pokaski-Azar J, Gosian J, Chapman J, King K, Sohl S, Danhauer S, Dunbar E, Gabriel MG, Huebner M, Hofmann SG, Khalsa SBS, Gaskins RB, Jennings E, Thind H, Fava JL, Hartman S, Bock BC, Gramann P, Haaz S, Bingham CO, Bartlett SJ, Hagins M, States R, Selfe T, Innes K, Harris AR, Jennings PA, Abenavoli RM, Katz DA, Hudecek KM, Greenberg MT, Jeter PE, Nkodo AF, Haaz S, Dagnelie G, Keosaian JE, Lemaster CM, Chao M, Saper RB, King KD, Gosian J, Doherty K, Walsh C, Pokaski Azar J, Chapman J, Danhauer SC, Moye J, Kinser P, Bourguignon C, Taylor A, Mahoney LA, Bayley PJ, Collery LM, Menzies-Toman D, Nilsson M, Frykman V, Noggle JJ, Braun T, Khalsa SBS, Nosaka M, Okamura H, Fukatu N, Potts A, Weidknecht K, Coulombe S, Davies B, Ryan C, Day D, Reale J, Staples JK, Knoefel J, Herman C, Riley KE, Park CL, Bedesin EY, Stewart VM, Riley KE, Braun TD, Park CL, Pescatello LS, Davis MB, Trehern AE, Mastronardi EL, Rioux J, Rosen RK, Thind H, Gaskins R, Jennings E, Morrow K, Williams D, Bock B, Rousseau D, Jackson E, Schmid AA, Miller KK, Van Puymbroeck M, Debaun EL, Schalk N, Dierks TD, Altenburger P, Damush T, Williams LS, Selman L, Citron T, Howie-Esquivel J, McDermott K, Milic M, Donesky D, Shook A, Ruzic R, Galloway F, Van Puymbroeck M, Miller KK, Schalk N, Schmid AA, Ward LJ, Stebbings S, Sherman K, Cherkin D, Baxter GD, West JI, Duffy N, Liang B. 2013 SYR Accepted Poster Abstracts. Int J Yoga Therap 2013; 23:32-53. [PMID: 24016822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
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