1. Muhimbili Wellcome Programme, Department of Haematology and Blood Transfusion, Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania
2. Department of Medicine, Weill Bugando School of Medicine, Catholic University of Health and Allied Sciences, Mwanza, Tanzania
3. Department of Medicine, Weill Cornell Medical College, New York, NY, USA
4. Department of Biochemistry, Weill Bugando School of Medicine, Catholic University of Health and Allied Sciences, Mwanza, Tanzania
5. Department of Paediatrics, Weill Bugando School of Medicine, Catholic University of Health and Allied Sciences, Mwanza, Tanzania
6. Nuffield Department of Medicine, University of Oxford, UK