Mai Utada,^1,* Alina V. Brenner,¹ Dale L. Preston,² John B. Cologne,¹ Ritsu Sakata,¹ Hiromi Sugiyama,¹ Naohiro Kato,¹ Eric J. Grant,¹ Elizabeth K. Cahoon,³ Kiyohiko Mabuchi,³ Kotaro Ozasa<sup>1

1</sup>Radiation Effects Research Foundation, Hiroshima and Nagasaki, Japan
²Hirosoft International, Eureka, California
³Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Department of Health and Human Services, Bethesda, Maryland

^* Address for correspondence: Department of Epidemiology, Radiation Effects Research Foundation, 5-2 Hijiyama Park, Minami-ku, Hiroshima 732-0815, Japan; e-mail: utada@rerf.or.jp.