1 Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima, Japan, Department of Epidemiology, Fukushima Medical University School of Medicine, Fukushima, Japan, teoohira@fmu.ac.jp Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima, Japan, National Institute of Public Health, Saitama, Japan Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima, Japan, Department of Public Health, Fukushima Medical University School of Medicine, Fukushima, Japan.