1. Division of Hematology, Children's National Medical Center; Washington District of Columbia
2. The George Washington University School of Medicine and Health Sciences; Washington District of Columbia
3. Division of Pathology; St Louis University; St Louis Missouri
4. Department of Radiology; Washington University School of Medicine; St Louis Missouri
5. Rodeghier Consultants; Chicago Illinois
6. Department of Pediatrics, Division of Hematology; Johns Hopkins School of Medicine; Baltimore Maryland
7. Pediatric Radiology and Neuroradiology Sections, Washington University School of Medicine; St. Louis Missouri
8. Department of Pediatrics, Vanderbilt-Meharry Center of Excellence in Sickle Cell Disease; Vanderbilt University Medical Center; Nashville Tennessee