1 Research and Education Faculty, Medical Sciences Cluster, Health Service Center, Kochi University 2-5-1, Akebono-cho, Kochi-shi, Kochi, 780-8520, Japan; The Center for Peace, Hiroshima University 1-1-89, Higashisendamachi, Naka-ku, Hiroshima-shi, Hiroshima, 730-0053, Japan. Electronic address: ke-inoue@med.shimane-u.ac.jp.
2 The Center for Peace, Hiroshima University 1-1-89, Higashisendamachi, Naka-ku, Hiroshima-shi, Hiroshima, 730-0053, Japan. Electronic address: nkawano@hiroshima-u.ac.jp.
3 Research Institute for Radiation Biology and Medicine, Hiroshima University, 1-2-3, Kasumi, Minami-ku, Hiroshima-shi, Hiroshima, 734-8553, Japan. Electronic address: nfjm@hiroshima-u.ac.jp.
5 The Center for Peace, Hiroshima University 1-1-89, Higashisendamachi, Naka-ku, Hiroshima-shi, Hiroshima, 730-0053, Japan. Electronic address: mhoshi@hiroshima-u.ac.jp.