Kayoko Ishihara,^1,* Naohiro Kato,² Munechika Misumi,² Hiroko Kitamura,^1,3 Ayumi Hida,¹ Michiko Yamada<sup>1

1</sup>Departments of Clinical Studies
²Departments of Statistics, Radiation Effects Research Foundation, Hiroshima, Japan
³Occupational Health Training Center, University of Occupational and Environmental Health, Fukuoka, Japan

^*Address for correspondence: Department of Clinical Studies, Radiation Effects Research Foundation, 5-2 Hijiyama Park, Minamiku, Hiroshima 732-0815, Japan; email: kishihara-kawase@umin.ac.jp.