1. Department of Endocrinology and Diabetes, Nagoya University Graduate School of Medicine, Nagoya 466-8550, Japan
2. Department of Endocrinology and Diabetes, Nagoya University Hospital, Nagoya 466-8560, Japan
3. The First Department of Medicine, Wakayama Medical University, Wakayama 641-8509, Japan
4. Division of Nephrology and Endocrinology, University of Tokyo Graduate School of Medicine, Tokyo 113-8655, Japan
5. Department of Metabolic Medicine, Osaka University Graduate School of Medicine, Suita 565-0871, Japan
6. Department of Endocrinology and Metabolism, Hirosaki University Graduate School of Medicine, Hirosaki 036-8562, Japan
7. Department of Internal Medicine (I), Osaka Medical College, Takatsuki 569-8686, Japan