1. Department of Pathology, Hiroshima Red Cross Hospital and Atomic-bomb Survivors Hospital, Hiroshima, Japan;
2. Department of Epidemiology, and
3. Department of Clinical Studies, Radiation Effects Research Foundation, Hiroshima, Japan;
4. Hirosoft International Corporation, Eureka, CA; and
5. Radiation Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, MD