1. Department of Endocrinology and Metabolism, Hirosaki University Graduate School of Medicine, Aomori, Japan
2. Second Division, Department of Medicine, Hamamatsu University School of Medicine, Shizuoka, Japan
3. Department of Clinical and Molecular Endocrinology, Tokyo Medical and Dental University Graduate School, Tokyo, Japan
4. Department of Endocrinology, Metabolism and Nephrology, Kochi Medical School, Kochi, Japan