1. Department of Medicine; Division of Hematology; Duke University Medical Center; Durham North Carolina
2. Department of Pathology & Laboratory Medicine; University of North Carolina; Chapel Hill North Carolina
3. Division of Medical Genetics; Duke University Medical Center; Durham North Carolina
4. Transfusion Service; Duke Hospital; Durham North Carolina
5. Department of Medicine; Division of Hematology & Oncology; University of North Carolina; Chapel Hill North Carolina