1. Department of Endocrinology and Metabolism, Nagaoka Red Cross Hospital, Japan
2. Department of Hematology, Endocrinology and Metabolism, Niigata University Faculty of Medicine, Japan
3. Department of Hematology, Nagaoka Red Cross Hospital, Japan
4. Third Department of Internal Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Japan
5. Center of Diabetes, Endocrinology and Metabolism, Joetsu General Hospital, Japan