1. St. Jude Children's Research Hospital Memphis Tennessee USA
2. UPMC Children's Hospital of Pittsburgh Pittsburgh Pennsylvania USA
3. Children's Mercy Hospital Kansas City Missouri USA
4. University College London Hospitals NHS Foundation Trust London UK
5. Ann and Robert H. Lurie Children's Hospital of Chicago Chicago Illinois USA
6. St. Jude Affiliate Clinic Baton Rouge Baton Rouge Los Angeles USA
7. School of Medicine, Byblos and Nini Hospital Lebanese American University Tripoli Lebanon
8. Guy's and Saint Thomas' NHS Foundation Trust London UK
9. Division of Hematology Children's National Hospital Washington District of Columbia USA
10. Department of Pediatric Hematology Carle Foundation Hospital Urbana Illinois USA
11. American University of Beirut Medical Center Beirut Lebanon
12. Children's Hospital of Philadelphia Philadelphia Pennsylvania USA
13. Global Blood Therapeutics South San Francisco California USA
14. Emory + Children's Pediatric Institute Atlanta Georgia USA