1. Section of Hematology and Immunology, Department of Medicine, University of California School of Medicine, and the Irwin Memorial Blood Bank of the San Francisco Medical Society, San Francisco, California.
2. Section of Hematology and Immunology and Division of Clinical Pathology and Laboratory Medicine, Department of Medicine, University of California School of Medicine.
3. Section of Hematology and Immunology, Department of Medicine, University of California School of Medicine.
4. University of California School of Medicine; Director of Research, Irwin Memorial Blood Bank of the San Francisco Medical Society, San Francisco.
5. University of California School of Medicine.