1. Division of Radiation Oncology, Department of Radiology, Naval Medical Center Portsmouth, 620 John Paul Jones Circle, Portsmouth, VA 23314, USA
2. Department of Clinical Studies (Hiroshima), Radiation Effects Research Foundation (RERF), 5-2 Hijiyama Park, Minami-ku, Hiroshima City, Japan
3. Department of Statistics, RERF, 5-2 Hijiyama Park, Minami-ku, Hiroshima City, Japan
4. Department of Genetics, RERF, 5-2 Hijiyama Park, Minami-ku, Hiroshima City, Japan
5. Associate Chief of Research, RERF, 5-2 Hijiyama Park, Minami-ku, Hiroshima City, Japan
6. Department of Radiation Biology/Molecular Epidemiology, RERF, 5-2 Hijiyama Park, Minami-ku, Hiroshima City, Japan
7. Department of Clinical Studies (Nagasaki), RERF, 8-6 Nakagawa 1-chome, Nagasaki City, Japan