1 Department of Radiation Health Management, Fukushima 960-1295, Japan; Jyoban Hospital of Tokiwa Foundation, Iwaki, Japan. Electronic address: toyoakisawano@gmail.com.
2 Department of Radiation Health Management, Fukushima 960-1295, Japan.
3 Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima 960-1295, Japan.
4 Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima 960-1295, Japan; Research Institute for Radiation Biology and Medicine, Hiroshima University, Hiroshima, Japan.
5 Fukushima Medical University School of Medicine, Fukushima 960-1295, Japan.