1. Department of Laboratory Medicine, School of Medicine, Fukushima Medical University, Fukushima 960-1295, Japan
2. Thyroid and Endocrinology Center, Fukushima Medical University Hospital, Fukushima 960-1295, Japan
3. Department of Clinical Laboratory Medicine, Fukushima Medical University Hospital, Fukushima 960-1295, Japan
4. Third Department of Internal Medicine, Faculty of Medicine, University of Yamanashi, Yamanashi 409-3898, Japan
5. Department of Thyroid and Endocrinology, School of Medicine, Fukushima Medical University, Fukushima 960-1295, Japan