1. Department of Statistics, Radiation Effects Research Foundation, Hiroshima, Japan
2. Department of Clinical Studies, Radiation Effects Research Foundation, Hiroshima, Japan
3. Department of Food and Health Sciences, International College of Arts and Sciences, Fukuoka Women's University, Fukuoka, Japan
4. Center for Clinical Sciences, Department of Epidemiology and Prevention, National Center for Global Health and Medicine, Tokyo, Japan
5. Department of Epidemiology, Radiation Effects Research Foundation, Hiroshima, Japan
6. Graduate School of Integrated Science and Technology, Department of Informatics, Shizuoka University, Shizuoka, Japan