1. Aerospace Medical Laboratory (Clinical) and the Hematology-Oncology Service, Wilford Hall USAF Medical Center, Lackland Air Force Base, Texas.
2. MRC Experimental Hematology Unit, St. Mary's Hospital Medical School, London, England; formerly Research Associate, Aerospace Medical Laboratory (Clinical), Wilford Hall USAF Medical Center, Lackland Air Force Base, Texas.
3. Hematology-Oncology Service, Wilford Hall USAF Medical Center, Lackland Air Force Base, Texas.