1. Department of Paediatrics and Child Health Muhimbili National Hospital (MNH) Dar‐es‐SalaamTanzania
2. Department of Paediatrics and Child Health Muhimbili University of Health and Allied Sciences (MUHAS) Dar‐es‐Salaam Tanzania
3. Department of Haematology Cambridge Institute for Medical Research CambridgeUK
4. Department of Haematology University of Cambridge CambridgeUK
5. Wellcome Trust‐Medical Research Council Stem Cell Institute University of Cambridge Cambridge UK
6. University of Florence Firenze Italy