1. Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima, Japan.
2. Department of Radiation Medical Sciences, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Japan.
3. Department of Radiation Molecular Epidemiology, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Japan.
4. Department of Thyroid and Endocrinology, Fukushima Medical University School of Medicine, Fukushima, Japan.
5. Department of Laboratory Medicine, Fukushima Medical University School of Medicine, Fukushima, Japan.