1. Department of Medicine University of Illinois at Chicago Chicago Illinois USA
2. Macha Research Trust Choma Zambia
3. University of Utah and ARUP Laboratories Salt Lake City Utah USA
4. Division of Pulmonary, Allergy and Critical Care Medicine University of Pittsburgh Medical Center Pittsburgh Pennsylvania USA
5. Children's National Medical Center Washington District of Columbia USA
6. Center for Sickle Cell Disease Montefiore Medical Center New York New York USA
7. Department of Pediatrics and Child Health Howard University Hospital Washington District of Columbia USA
8. CSL Behring King of Prussia, PA
9. Center for Sickle Cell Disease Howard University Washington District of Columbia USA
10. Indiana University School of Medicine Indianapolis, IN
11. University of Utah Salt Lake City, Utah