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Gibson SMP, Hunter TA, Charles PE, Morgan MAC, Griffith-Anderson SKR, Cruickshank JK, Gossell-Williams MD, Johnson NA. Current obstetric outcomes in Jamaican women with sickle hemoglobinopathy - a balance of risks for aspirin? J Perinat Med 2024; 52:485-493. [PMID: 38629833 DOI: 10.1515/jpm-2023-0378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Accepted: 02/29/2024] [Indexed: 06/02/2024]
Abstract
OBJECTIVES Sickle cell disease (SCD) occurs in 2.8 % of our Jamaican antenatal population with homozygous HbSS being most associated with adverse maternal and perinatal outcomes. METHODS A retrospective comparative analysis of HbSS, HbSC and HbSβThal pregnancy outcomes at the University Hospital of the West Indies (UHWI) between January 2012 and December 2022 was conducted. RESULTS Of 120 patients (138 pregnancies), obesity occurred in 36 % (20/56) of the 'non-HbSS' group, i.e. HbSβThal (55 %, 5/9) and HbSC (32 %, 15/47) combined vs. 9.7 % of the HbSS (8/82). HbSS patients had more crises requiring transfusions, acute chest syndrome (ACS), maternal 'near-misses' (OR=10.7, 95 % 3.5-32.3; p<0.001), hospitalizations (OR 7.6, 95 % CI 3.4-16.9; p<0.001), low birth weight (LBW) neonates (OR 3.1, 1.1-8.9; p=0.037) and preterm birth (OR=2.6, 1.2-5.8; p=0.018) compared to HbSC and HbSβThal. Low dose aspirin was prescribed in 43 %. Logistic regression showed those NOT on aspirin (n=76) had more miscarriages (22 v. 2 %), were LESS likely to have a live birth (75 v. 95 % (0.2, 0.04-0.57, p=0.005)), but surprisingly had fewer painful crises (28 v. 46 % (0.5, 0.03-0.9, p=0.03)). CONCLUSIONS HbSS women had a 10-fold excess of maternal near-misses. Additional research may further clarify the effects of aspirin on pregnancy outcomes as related to SCD genotypes.
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Affiliation(s)
- Shanea M P Gibson
- Department of Obstetrics and Gynaecology, 233759 University Hospital of the West Indies , Mona, Jamaica
| | - Tiffany A Hunter
- Department of Obstetrics and Gynaecology, 233759 University Hospital of the West Indies , Mona, Jamaica
- Department of Obstetrics and Gynaecology, 62707 University of the West Indies , Mona, Jamaica
| | - Phillip E Charles
- Department of Obstetrics and Gynaecology, 233759 University Hospital of the West Indies , Mona, Jamaica
- Department of Obstetrics and Gynaecology, 62707 University of the West Indies , Mona, Jamaica
| | - Melonie A C Morgan
- Department of Obstetrics and Gynaecology, 62707 University of the West Indies , Mona, Jamaica
| | - Shari K R Griffith-Anderson
- Department of Obstetrics and Gynaecology, 233759 University Hospital of the West Indies , Mona, Jamaica
- Department of Obstetrics and Gynaecology, 62707 University of the West Indies , Mona, Jamaica
| | | | | | - Nadine A Johnson
- Department of Obstetrics and Gynaecology, 233759 University Hospital of the West Indies , Mona, Jamaica
- Department of Obstetrics and Gynaecology, 62707 University of the West Indies , Mona, Jamaica
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Hachey SM, Joseph S, Dolin CD, Triebwasser JE, Sayani F, Hamm RF. Contemporary Obstetric and Neonatal Outcomes in Sickle Cell Disease: A Retrospective Cohort Study. Am J Perinatol 2024; 41:e2291-e2298. [PMID: 37494482 DOI: 10.1055/s-0043-1771050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 07/28/2023]
Abstract
OBJECTIVE Sickle cell disease is associated with adverse perinatal outcomes. Aspects of sickle cell disease in pregnancy, such as health care utilization and neonatal abstinence syndrome, are understudied. We aimed to describe contemporary sickle cell disease outcomes in a U.S. hospital system to improve perinatal counseling. STUDY DESIGN We conducted a retrospective cohort study of patients with sickle cell disease who delivered at >20 weeks' gestation at two sites within the University of Pennsylvania Health System from May 1, 2017 to August 30, 2020. Descriptive statistics were utilized. RESULTS Over the study period, 48 patients with sickle cell disease had 52 deliveries of 53 neonates. Sickle cell disease-related morbidity was prevalent prior to pregnancy; 27% had a history of avascular necrosis, and 58% had experienced acute chest syndrome. In the year prior to pregnancy, 52% used daily opioids. During pregnancy, more than half of patients were admitted at least once for sickle cell disease-related complications, spending a median 3 days admitted interquartile range (0-23); >10% spent >70 days of pregnancy admitted. New daily opioids were prescribed during pregnancy for 10% to manage pain crises. Acute chest syndrome was experienced by 23% of patients during pregnancy, and 8% required placement of long-term intravenous access. Preterm delivery <37 weeks occurred in 48%. The primary cesarean rate in nulliparas was 43%. Additionally, 50% experienced a hypertensive disorder of pregnancy, 35% underwent transfusion during delivery admission, and 10% had a perinatal venous thromboembolism. Finally, 53% of neonates were admitted to the intensive care unit. Low birth weight was noted in 34%, severe respiratory distress in 15% of infants, and neonatal abstinence syndrome in 21%. CONCLUSION Sickle cell disease remains associated with significant perinatal morbidity and need for hospitalization. These data provide contemporary outcomes to target improvements in the care of patients with sickle cell disease. KEY POINTS · SCD was associated with significant perinatal morbidity and healthcare utilization.. · Most patients with SCD required hospitalization during pregnancy.. · Neonates of patients with SCD experienced preterm birth, NICU admission, and neonatal abstinence syndrome..
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Affiliation(s)
- Sara M Hachey
- Department of Obstetrics and Gynecology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Sophie Joseph
- Department of Obstetrics and Gynecology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Cara D Dolin
- Department of Obstetrics and Gynecology, Cleveland Clinic, Cleveland, Ohio
| | - Jourdan E Triebwasser
- Department of Obstetrics and Gynecology, University of Michigan, Ann Arbor, Michigan
| | - Farzana Sayani
- Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Rebecca F Hamm
- Department of Obstetrics and Gynecology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
- Leonard Davis Institute of Health Economics, Perelman School of Medicine, Philadelphia, Pennsylvania
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Sikdar O, Ambulkar H, Jenkinson A, Hedley C, Johns J, Bhat R, Dassios T, Harris C, Greenough A. Maternal and infant outcomes in women with sickle cell disease: a matched cohort study. Arch Dis Child Fetal Neonatal Ed 2024:fetalneonatal-2024-326848. [PMID: 38604649 DOI: 10.1136/archdischild-2024-326848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Accepted: 03/25/2024] [Indexed: 04/13/2024]
Abstract
OBJECTIVE Women with sickle cell disease (SCD) have adverse maternal and infant outcomes. Our aim was to determine whether the outcomes of SCD mothers and their infants differed from African or Caribbean women not affected by SCD and whether there were differences between SCD individuals with the haemoglobin SS (HbSS) or haemoglobin SC (HbSC) genotypes. Furthermore, we wished to determine if any differences related to deprivation. DESIGN A matched cohort study. SETTING Tertiary perinatal centre in London PATIENTS: 4964 African or Caribbean women without SCD and 148 with SCD. MAIN OUTCOME MEASURES Mode of delivery, maternal exchange transfusion, birthweight, neonatal unit admission, neonatal death and deprivation indices RESULTS: SCD women were more likely to be delivered by caesarean section (p<0.001) and had babies of lower birthweight (p<0.001). Their infants were no more likely to be admitted to neonatal intensive care unit or suffer a neonatal death. There were no significant differences between the SCD women and those without SCD in their deprivation index or deprivation decile. The women with the HbSS genotype compared to those with the HbSC genotype were more anaemic (p<0.02), required more exchange transfusions (p<0.001) and were more likely to be delivered by caesarean section (p=0.008). The infant outcomes did not differ significantly between the genotypes. CONCLUSIONS Although, the SCD women, particularly those with the HbSS genotype, had greater morbidity, infant morbidity, and mortality was similar in mothers with the HbSS or HbSC genotypes and those without SCD.
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Affiliation(s)
- Oishi Sikdar
- Department of Women and Children's Health, King's College London, London, UK
| | - Hemant Ambulkar
- Neonatal Intensive Care Unit, King's College Hospital NHS Foundation Trust, London, UK
| | - Allan Jenkinson
- Department of Women and Children's Health, King's College London, London, UK
| | - Catherine Hedley
- Department of Obstetrics and Gynaecology, King's College Hospital NHS Foundation Trust, London, UK
| | - Jemma Johns
- Department of Obstetrics and Gynaecology, King's College Hospital NHS Foundation Trust, London, UK
| | - Ravindra Bhat
- Neonatal Intensive Care Unit, King's College Hospital NHS Foundation Trust, London, UK
| | - Theodore Dassios
- Department of Women and Children's Health, King's College London, London, UK
- Neonatal Intensive Care Unit, King's College Hospital NHS Foundation Trust, London, UK
| | - Christopher Harris
- Department of Women and Children's Health, King's College London, London, UK
- Neonatal Intensive Care Unit, King's College Hospital NHS Foundation Trust, London, UK
| | - Anne Greenough
- Department of Women and Children's Health, King's College London, London, UK
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Sinkey RG, Ogunsile FJ, Kanter J, Bean C, Greenberg M. Society for Maternal-Fetal Medicine Consult Series #68: Sickle cell disease in pregnancy. Am J Obstet Gynecol 2024; 230:B17-B40. [PMID: 37866731 PMCID: PMC10961101 DOI: 10.1016/j.ajog.2023.10.031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2023]
Abstract
Pregnant individuals with sickle cell disease have an increased risk of maternal and perinatal morbidity and mortality. However, prepregnancy counseling and multidisciplinary care can lead to favorable maternal and neonatal outcomes. In this consult series, we summarize what is known about sickle cell disease and provide guidance for sickle cell disease management during pregnancy. The following are Society for Maternal-Fetal Medicine recommendations.
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Martinborough T, Allen-Davis W, Hunter-Greaves T, Thame M, Reid M, Simms-Stewart D. Maternal morbidity and mortality associated with mode of delivery in sickle cell disease. J OBSTET GYNAECOL 2022; 42:3560-3567. [PMID: 36541410 DOI: 10.1080/01443615.2022.2158314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
This retrospective observational study compared pregnancy outcomes based on mode of delivery in women with homozygous sickle cell disease (HbSS) to women without (HbAA) using delivery records of 48,600 parturients between January 1992 and January 2020. Fisher's exact tests and Mann-Whitney's test were used to analyse variables based on sickle cell status. Vaginal delivery and HbSS were more associated with labour induction/augmentation (AOR = 2.4, (0.7-7.8)), intrapartum complications (AOR = 2.6, (0.5-14)), postpartum haemorrhage (AOR = 2.8 (0.5-15.2)) and postpartum infections (AOR = 9.6 (1.7-54.4)). Caesarean delivery resulted in more postpartum infections in the HbSS group (AOR = 23.6 (0.9-638.4)). Vaginal delivery in HbSS resulted in more intrapartum complications and postpartum haemorrhage but caesarean delivery greatly increased the risk of postpartum infections and hypertensive disorders. Sickle cell disease (SCD) did not confer increased risk of adverse perinatal outcomes regardless of mode of delivery.Impact StatementWhat is already known on this subject? Women with homozygous sickle cell disease (SCD) are at an increased risk of postpartum infections, undergoing caesarean delivery, admission to the neonatal intensive care unit and overall perinatal mortality when compared to women with normal haemoglobin genotype. Comparisons have been made between homozygous SS disease and haemoglobin SC disease revealing higher rates of maternal and foetal morbidity in both groups.What do the results of this study add? Studies comparing maternal and foetal morbidity based on mode of delivery are lacking. To our knowledge, this study is the first examine maternal and perinatal outcomes in women with SCD undergoing vaginal and abdominal delivery compared to women with normal haemoglobin. We found that vaginal delivery in SCD is associated with more postpartum haemorrhage and caesarean delivery was linked to more hypertensive disorders and postpartum infections then compared to women with normal haemoglobin. Converse to other reports, there was no difference in perinatal outcomes based on mode of delivery.What are the implications of these findings for clinical practice and/or further research? Caesarean delivery and SCD greatly increased the risk of postpartum infections and hypertensive disorders but did not confer a higher risk of postpartum haemorrhage. There were more maternal deaths in SCD women who underwent caesarean vs. vaginal delivery and this requires further study to determine the pregestational predictors of adverse outcomes. Women with SCD who achieve a successful primary vaginal delivery may have reduced risk of complications in subsequent pregnancies, possibly comparable to women without the disease.
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Affiliation(s)
- Tracey Martinborough
- Department of Obstetrics and Gynecology, University Hospital of the West Indies, Kingston, Jamaica
| | - Wendy Allen-Davis
- Department of Obstetrics and Gynecology, University Hospital of the West Indies, Kingston, Jamaica
| | - Tiffany Hunter-Greaves
- Department of Obstetrics and Gynecology, University Hospital of the West Indies, Kingston, Jamaica
| | - Minerva Thame
- Deans Office, Faculty of Medical Sciences, University of the West Indies, Kingston, Jamaica
| | - Marvin Reid
- Deans Office, Faculty of Medical Sciences, University of the West Indies, Kingston, Jamaica
| | - Donnette Simms-Stewart
- Department of Obstetrics and Gynecology, University Hospital of the West Indies, Kingston, Jamaica
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Evidence-based obstetric management of women with sickle cell disease in low-income countries. HEMATOLOGY. AMERICAN SOCIETY OF HEMATOLOGY. EDUCATION PROGRAM 2022; 2022:414-420. [PMID: 36485120 PMCID: PMC9821549 DOI: 10.1182/hematology.2022000377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Pregnancy in women with sickle cell disease (SCD) is fraught with complications, some of which are life-threatening. Managing pregnancy in these women can be challenging, especially with poor resources, which is often the case in low-income countries. In Nigeria, for instance, up to 90% of patients pay out of pocket for medical care due to the poorly developed health insurance system, and this worsens the morbidity and mortality associated with this condition. We describe a pragmatic approach to routinely managing pregnant women with SCD in the antenatal period, showing the feasibility of effective management of these high-risk pregnancies in limited-resource settings. We also present the case of a pregnant Nigerian woman with SCD who has intrauterine growth restriction (IUGR) and acute chest syndrome (ACS), conditions that are life-threatening for the fetus and the mother, respectively, and require prompt intervention. We highlight how we successfully managed this woman in a cost-effective manner by employing relatively inexpensive tests for diagnosis and treating her effectively with oxygen, appropriate antibiotics and manual exchange blood transfusion for the ACS, and finger pulse oximeters to monitor oxygen saturation. We explore pathophysiological concepts to IUGR in women with SCD and briefly discuss the appropriate mode of delivery, including the options for pain relief in labor.
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Moukalled NM, Bou Fakhredin R, Taher AT. Pregnancy and sickle cell disease: an overview of complications and suggested perinatal care. Expert Rev Hematol 2022; 15:1055-1061. [PMID: 36413684 DOI: 10.1080/17474086.2022.2151432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
INTRODUCTION Pregnancy in women with sickle cell disease (SCD) has been identified as high risk owing to increased incidence of materno-fetal complications across various studies and reports. These complications include consequences related to the underlying hemoglobinopathy; chronic anemia/associated inflammation, and pregnancy related including the risk for thromboembolism, bleeding and maternal mortality. Outcomes of neonates born to women with SCD has been suboptimal over the years with recent improvement due to strict monitoring, preventive and therapeutic measures. Much is yet to be unraveled regarding the optimal management of women with SCD during pregnancy, identifying target hemoglobin, delivery mode or timing among others. AREAS COVERED This review includes a summary of available data of the maternal and fetal outcomes; in addition to current recommendations for monitoring and management of women with SCD during pregnancy. EXPERT OPINION To have a successful pregnancy, women should be closely monitored, and interventions provided as needed to guarantee adequate management of anemia, as well as prevention, diagnosis and management of disease. They should also be educated regarding their reproductive health, emphasizing that pregnancy is possible, and achieving optimal results depends on providing adequate care in a health care facility with expertise in high-risk pregnancies and SCD.
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Affiliation(s)
- Nour M Moukalled
- Division of Hematology and Oncology, Department of Internal Medicine, American University of Beirut Medical Center, Beirut, Lebanon
| | - Rayan Bou Fakhredin
- Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
| | - Ali T Taher
- Division of Hematology and Oncology, Department of Internal Medicine, American University of Beirut Medical Center, Beirut, Lebanon
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McCaw-Binns A, Campbell L, Harris A, James LA, Asnani M. Maternal mortality among women with sickle cell disease in Jamaica over two decades (1998-2017). EClinicalMedicine 2022; 43:101238. [PMID: 34977515 PMCID: PMC8683691 DOI: 10.1016/j.eclinm.2021.101238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Revised: 11/24/2021] [Accepted: 11/26/2021] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Sickle cell disease (SCD) affects 2.8% of Jamaican antenatal women. Between 1998-2007 their maternal mortality ratio was 7-11 times higher than women without these disorders. We aim to determine if outcomes improved between 2008 and 17 amid declining fertility and changes in referral obstetric care. METHODS Maternal deaths in Jamaica's maternal mortality surveillance database (assembled since 1998) with SCD reported as underlying or associated cause of death were compared to those without known SCD, over two decades from 1998 to 2017. Social, demographic and health service variables were analysed using SPSS and EpiInfo Open. FINDINGS Over the two decades from 1998 to 2017, 806 (74%) of the 1082 pregnancy-associated deaths documented by the Jamaican Ministry of Health and Wellness were maternal deaths. The maternal mortality ratio (MMR) did not statistically change over the two periods for women with (p = 0.502) and without SCD (p = 0.629). The MMR among women with and without SCD in 2008-17 was 378.1 (n = 41) and 89.2/100,000 live births (n = 336) respectively, an odds ratio of 4.24 (95% CI: 3.07-5.87). When deaths due to their blood disorders were excluded, risk remained elevated at 2.17 (95% CI: 1.36-3.32). There was an upward trend in direct deaths over the two decades (p [trend]=0.051). INTERPRETATION MMRs were unchanged over two decades for Jamaicans with SCD. The high contribution to maternal mortality by women with SCD may explain some of the persistently higher mortality experience of women in the African diaspora. Multi-disciplinary evidence-based strategies need to be developed and tested which improve survival for women with SCD who want to have children. FUNDING No external funding was provided.
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Affiliation(s)
- Affette McCaw-Binns
- Department of Community Health & Psychiatry, Faculty of Medical Sciences, The University of the West Indies, Mona Campus, Kingston, Jamaica
| | - Leroy Campbell
- Victoria Jubilee Hospital, South-East Regional Health Authority, North Street, Kingston, Jamaica
| | - Ardene Harris
- Ministry of Health & Wellness, Epidemiology Unit, 10-16 Grenada Crescent, Kingston 5, Jamaica
| | - Lesley-Ann James
- Ministry of Health & Wellness, Epidemiology Unit, 10-16 Grenada Crescent, Kingston 5, Jamaica
| | - Monika Asnani
- Sickle Cell Unit, Caribbean Institute for Health Research, The University of the Indies, Mona Campus, Kingston 7, Jamaica
- Corresponding author at: Sickle Cell Unit, Caribbean Institute for Health Research, The University of the Indies, Mona Campus, Kingston 7, Jamaica.
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Oakley LL, Mitchell S, von Rege I, Hadebe R, Howard J, Robinson SE, Oteng-Ntim E. Perinatal outcomes in women with sickle cell disease: a matched cohort study from London, UK. Br J Haematol 2021; 196:1069-1075. [PMID: 34881428 DOI: 10.1111/bjh.17983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 11/01/2021] [Accepted: 11/19/2021] [Indexed: 11/29/2022]
Abstract
There are limited data on contemporary outcomes for women with sickle cell disease (SCD) in pregnancy. We conducted a single-site matched cohort study, comparing 131 pregnancies to women with SCD between 2007 and 2017 to a comparison group of 1310 pregnancies unaffected by SCD. Restricting our analysis to singleton pregnancies that reached 24 weeks of gestation, we used conditional Poisson regression to estimate adjusted risk ratios (aRRs) for perinatal outcomes. Infants born to mothers with SCD were more likely to be small for gestational age [aRR 1·69, 95% confidence interval (CI) 1·13-2·48], preterm (aRR 2·62, 95% CI 1·82-3·78) and require Neonatal Unit (NNU) admission (aRR 3·59, 95% CI 2·18-5·90). Pregnant women with SCD were at higher risk of pre-eclampsia/eclampsia (aRR 3·53, 95% CI 2·00-6·24), more likely to receive induction of labour (aRR 2·50, 95% CI 1·82-1·76) and caesarean birth (aRR 1·44, 95% CI 1·18-1·76). In analysis stratified by genotype, the risk of adverse outcomes was highest in haemoglobin SS (HbSS) pregnancies (n = 80). There was no strong evidence that haemoglobin SC (HbSC) pregnancies (n = 46) were at higher risk of preterm birth, caesarean delivery, or NNU admission. Pre-eclampsia/eclampsia was more frequently observed in HbSC pregnancies. Despite improvements in the care of pregnant women with SCD, the increased risk of adverse perinatal outcomes remains.
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Affiliation(s)
- Laura L Oakley
- Department of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, UK.,Centre for Fertility and Health, Norwegian Institute of Public Health, Oslo, Norway
| | - Sian Mitchell
- Department of Women & Children's Health, Guy's and St Thomas' NHS Foundation Trust, London, UK
| | - Inez von Rege
- Department of Women & Children's Health, Guy's and St Thomas' NHS Foundation Trust, London, UK
| | - Ruth Hadebe
- Department of Women & Children's Health, Guy's and St Thomas' NHS Foundation Trust, London, UK
| | - Jo Howard
- Department of Haematology, Guy's and St Thomas' NHS Foundation Trust, London, UK
| | - Susan E Robinson
- Department of Haematology, Guy's and St Thomas' NHS Foundation Trust, London, UK
| | - Eugene Oteng-Ntim
- Department of Women & Children's Health, Guy's and St Thomas' NHS Foundation Trust, London, UK
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