1. Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima 960-1295, Japan
2. Department of Thyroid and Endocrinology, Fukushima Medical University School of Medicine, Fukushima 960-1295, Japan
3. Department of Laboratory Medicine, Fukushima Medical University School of Medicine, Fukushima 960-1295, Japan
4. Department of Surgery, Minamisoma Municipal General Hospital, Fukushima 975-0033, Japan
5. Department of Head and Neck Surgery and Otolaryngology, Asahi University Hospital, Gifu 500-8856, Japan
6. Department of Epidemiology, Fukushima Medical University School of Medicine, Fukushima 960-1295, Japan
7. Department of Public Health, Fukushima Medical University School of Medicine, Fukushima 960-1295, Japan
8. Thyroid and Endocrine Center, Fukushima Global Medical Science Center, Fukushima Medical University, Fukushima 960-1295, Japan
9. Department of Thyroid Therapeutic Surgery, Fukushima Medical University School of Medicine, Fukushima 960-1295, Japan