1. Division of Biostatistics and Epidemiology RTI International Research Triangle Park North Carolina USA
2. Department of Hematology St. Jude Children's Research Hospital Memphis Tennessee USA
3. Sickle Cell Center Augusta University Augusta Georgia USA
4. Division of Hematology and Oncology Washington University School of Medicine St. Louis Missouri USA
5. Pediatric Hematology/Oncology Duke University Durham North Carolina USA
6. Department of Medicine University of Alabama Birmingham Alabama USA
7. Department of Emergency Medicine Icahn School of Medicine at Mount Sinai New York New York USA
8. Department of Hematology/Oncology UCSF Benioff Children's Hospital Oakland Oakland California USA
9. Department of Medicine University of Illinois at Chicago Chicago Illinois USA