[1] Univ Paris Cite, Necker Enfants Malad Hosp, Assistance Publ Hop Paris AP HP, Sickle Cell Ctr,Dept Gen Pediat & Pediat Infectiou, Paris, France
[2] Univ South Carolina, Dept Pediat Hematol Oncol, PRISMA Hlth Comprehens SCD Program, Sch Med, Greenville, SC USA
[3] Univ Campinas UNICAMP, Haematol & Haemotherapy Ctr, Sch Med, Campinas, SP, Brazil
[4] Guys & St Thomas NHS Fdn Trust, Evelina London Childrens Hosp, Dept Paediat Haematol, London, England
[5] King Faisal Specialist Hosp & Res Ctr, Dept Pediat Oncol Hematol Bone Marrow Transplant, Jeddah, Saudi Arabia
[6] Heidelberg Univ, Hopp Childrens Canc Ctr Heidelberg KiTZ, Dept Pediat Oncol Hematol & Immunol, Heidelberg, Germany
[7] Sickle Cell Dis Assoc Canada, Toronto, ON, Canada
[8] German Sickle Cell Dis & Thalassaemia Assoc, IST eV, Eschweiler, Germany
[9] Sickle Cell Soc, London, England
[10] Sickle Cell Dis Assoc Amer Inc, Hanover, MD USA
[11] Pfizer Inc, New York, NY USA
[12] Ipsos Healthcare, London, England
[13] Hosp Sick Children, Div Hematol Oncol, 555 Univ Ave, Toronto M5G 1X8, ON, Canada