1. Medicine Branch, National Cancer Institute, and the Ophthalmology Branch, National Institute of Neurologic Diseases and Blindness, Bethesda, Md.
2. Stanford University School of Medicine, Palo Alto, Calif.; formerly Clinical Associate, Medicine Branch, National Cancer institute, Bethesda, Md.
3. Ophthalmology Branch, Natiorial Institute of Neurologic Diseases and Blindness, Bethesda, Md.
4. The University of Texas M. D. Anderson Hospital and Tumor Institute, Houston, Texas; formerly Head, Leukemia Service, Medicine Branch, National Cancer Institute, Bethesda, Md.