1. Department of Medicine and Clinical Science, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama, Japan
2. Department of Medicine, Division of Metabolism and Biosystemic Science, Asahikawa Medical College, Hokkaido, Japan
3. Division of Nephrology and Hypertension, Diabetes Center, Tokyo Women's Medical University School of Medicine, Tokyo, Japan
4. Department of Endocrinology, Diabetes, and Metabolism, Kitasato University School of Medicine, Kanagawa, Japan
5. Division of Nephrology, Tohoku University Graduate Medical School, Miyagi, Japan
6. Department of Medicine, Diabetes Center, Tokyo Women's Medical University School of Medicine, Tokyo, Japan
7. Department of Medicine, Medical School, Juntendo University, Tokyo, Japan
8. Division of Biostatistics, School of Pharmaceutical Sciences, Kitasato University, Tokyo, Japan
9. Division of Endocrinology and Diabetes, Department of Medicine, Saitama Medical School, Saitama, Japan