1. Thyroid Examination Expert Committee, Diagnostic Criteria Subcommittee for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima 960-1295, Japan
2. Department of Pathology and Laboratory Medicine, Omori Red Cross Hospital, Tokyo 143-8527, Japan
3. Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima 960-1295, Japan
4. Department of Thyroid and Endocrinology, Fukushima Medical University, Fukushima 960-1295, Japan
5. Department of Pathology, Fukushima Medical University, Fukushima 960-1295, Japan
6. The Thyroid and Endocrine Center, Fukushima Medical University Hospital, Fukushima 960-1295, Japan
7. Research Institute for Radiation Biology and Medicine, Hiroshima University, Hiroshima 734-8553, Japan
8. Department of Laboratory Medicine, Fukushima Medical University, Fukushima 960-1295, Japan