aCenter for Cell and Gene Therapy, Baylor College of Medicine

bTexas Children's Cancer and Hematology Center, Texas Children's Hospital

cDepartment of Pediatrics, Baylor College of Medicine, Houston, Texas, USA

dDepartment of Paediatrics and Child Health, Makerere University College of Health Sciences, Kampala, Uganda

eSchool of Medicine, The Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania

Correspondence to Tami D. John, MD; 6621 Fannin St. Houston, TX 77030, USA; Tel +1 832-824-1000;. e-mail: [email protected]