1. Graduate School of Medicine, Kurume University, Kurume, Japan
2. Department of bClinical Studies, Hiroshima, Japan
3. Institute of Radiation Epidemiology, Radiation Effects Association, Tokyo, Japan
4. Department of Epidemiology, Nagasaki, Japan, Radiation Effects Research Foundation, Hiroshima/Nagasaki, Japan
5. Department of Epidemiology, Hiroshima, Japan, Radiation Effects Research Foundation, Hiroshima/Nagasaki, Japan
6. Biostatistics Center, Kurume University, Kurume, Japan