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