1. Department of Haematology and Blood Transfusion, Muhimbili University of Health and Allied Sciences, P.O. Box 65001, Dar es Salaam, Tanzania
2. Nuffield Department of Medicine, University of Oxford, Oxford, UK
3. Department of Pediatrics, Emory University School of Medicine, Atlanta, GA, USA
4. School of Allied Health Sciences, College of Health Sciences, University of Ghana, Ghana
5. Department of Haematology and Blood Transfusion, College of Health Sciences, University of Abuja, Abuja, Nigeria
6. Division of Human Genetics, Faculty of Heath Sciences, University of Cape Town, South Africa
7. Faculty of Medicine and Biomedical Sciences, University of Yaoundé I, Cameroon
8. Children’s Hospital of Philadelphia, Philadelphia, PA, USA