1 Department of Radiation Health Management, Fukushima Medical University School of Medicine, Fukushima, Japan.
2 Department of Radiation Health Management, Fukushima Medical University School of Medicine, Fukushima, Japan; Department of Internal Medicine, Soma Central Hospital, Soma, Japan.
3 Department of Health Informatics, Kyoto University School of Public Health, Sakyo-ku, Kyoto, Japan.