1. Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima, Japan.
2. Department of Laboratory Medicine; Fukushima Medical University, Fukushima, Japan.
3. Department of Thyroid and Endocrinology; Fukushima Medical University, Fukushima, Japan.
4. Department of Thyroid and Endocrine Center, Fukushima Global Medical Science Center; Fukushima Medical University, Fukushima, Japan.
5. Department of Epidemiology, and Fukushima Medical University, Fukushima, Japan.
6. Department of Public Health; School of Medicine, Fukushima Medical University, Fukushima, Japan.
7. Research Institute for Radiation Biology and Medicine, Hiroshima University, Hiroshima, Japan.