1. Hematology Department of The Hektoen Institute for Medical Research of the Cook County Hospital, and the Department of Medicine, Northwestern University, Chicago, Ill.
2. The Hektoen institute for Medical Research, Cook County Hospital, Chicago, Ill. Current Address: Lackkind Air Force Base Hospital, San Antonio, Texas.
3. The Hektoen Institute for Medical Research, Cook County hospital, Chicago, Ill.
4. Northwestern University Medical School; Director, Department of Hematology, The hlektoen Institute for Medical Research, Cook County Hospital, Chicago, Ill.
5. The Hektoen Institute for Medical Research, Chicago, Ill.