1. Department of Hematology and Blood Transfusion College of Medicine/Lagos University Teaching Hospital Lagos Nigeria
2. Division of Pediatric Hematology and Oncology, College of Medicine Lagos University Teaching Hospital Lagos Nigeria
3. Department of Medicine College of Medicine/Lagos University Teaching Hospital Lagos Nigeria
4. Division of Transfusion Medicine and Pediatrics, Division of Hematology/Oncology, Departments of Pathology, Microbiology and Immunology Vanderbilt University Medical Center Nashville Tennessee USA
5. Division of Hematology/Oncology, Department of Medicine, Vanderbilt‐Meharry Center for Excellence in Sickle Cell Disease Vanderbilt University Medical Center Nashville Tennessee USA