1. Department of Medicine and the Lane Research Laboratory, Duke University Medical Center, Durham, North Carolina.
2. Division of Hematology, Department of Medicine, Duke University Medical Center, Durham, N. C.; formerly U.S. Public Health Service Trainee in Hematology and Cancer Research (T4 CA 5042).
3. John and Mary Markle Scholar in Academic Medicine, and Director, Division of Hematology and Oncology, Ohio State University College of Medicine, Columbus, Ohio.
4. Division of Behavioral Medicine, Department of Medicine, Duke University Medical Center, Durham, N. C.
5. Division of Allergy, Department of Medicine, Duke University Medical Center, Durham, N. C.