1. Division of Hematology, Department of Medicine, and the Fircrest Research Laboratories, Department of Pediatrics, University of Washington School of Medicine, Seattle, Wash. and from the Universidad Peruana Cayetano Heredia, Lima, Peru.
2. Department of Medicine, University of Washington, Seattle, Wash.
3. University of Washington and Physician, Fircrest School, Seattle. Wash.
4. University of Washington and Fircrest Research Laboratories, Seattle, Wash.
5. Department of Medicine, University of Witwatersrand Medical School, Johannesburg, South Africa.
6. Universidad Peruana Cayetano Heredia, Lima, Peru.
7. Division of Hematology, University of Washington, Seattle, Wash.