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