1. Department of Hematology, St Jude Children’s Research Hospital, Memphis, TN;
2. Division of Pediatric Cardiology, Le Bonheur Children’s Hospital, Memphis, TN;
3. Cardiopulmonary Services, St Jude Children’s Research Hospital, Memphis, TN;
4. Division of Pediatric Hematology Oncology, Baylor College of Medicine, Houston, TX;
5. Department of Biostatistics and
6. Department of Infectious Diseases, St Jude Children’s Research Hospital, Memphis, TN; and
7. Center for Sickle Cell Disease, University of Tennessee Health Science Center, Memphis, TN