1 Sickle Cell Unit, Caribbean Institute for Health Research, The University of The West Indies, Mona, Jamaica.
2 Liverpool Paediatric Haemophilia Centre, Haematology Treatment Centre, Alder Hey Children's Hospital, NHS Foundation Trust, Liverpool, United Kingdom.
3 Department of Paediatric Haematology, Kings College Hospital, NHS Foundation Trust, London, United Kingdom.
4 Department of Paediatric Haematology, Evelina London Children's Hospital, Guy's and St. Thomas NHS Foundation Trust, London, United Kingdom.
5 Department of Paediatric Haematology, Royal London Hospital, Barts Health NHS Trust, London, United Kingdom.
6 Department of Paediatric Haematology, Birmingham Children's Hospital NHS Foundation Trust, Birmingham, United Kingdom.
7 Division of Hematology and Global Health Center, Cincinnati Children's Hospital, Cincinnati, OH.
8 Bast Inc Limited, Leicester, United Kingdom.
9 Nova Laboratories Limited, Leicester, United Kingdom.