1. Departments of Statistics
2. Department of Preventive Medicine, College of Medicine, Keimyung University, Daegu, Korea
3. Departments of Epidemiology, Radiation Effects Research Foundation, Hiroshima, Japan
4. Hirosoft International, Eureka, California
5. Radiation Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, Maryland