1. Department of Rheumatology, Endocrinology and Nephrology Faculty of Medicine and Graduate School of Medicine Hokkaido University Sapporo Japan
2. Clinical Research and Medical Innovation Center Hokkaido University Hospital Sapporo Japan
3. Third Department of Internal Medicine Hokkaido PWFAC Obihiro‐Kosei General Hospital Obihiro Japan
4. Sapporo Diabetes and Thyroid Clinic Sapporo Japan
5. Division of Diabetes and Endocrinology Department of Medicine Sapporo Medical Center NTT East Corporation Sapporo Japan
6. Diabetes Center Manda Memorial Hospital Sapporo Japan
7. Department of Internal Medicine Jiyugaoka Medical Clinic Obihiro Japan
8. Kurihara Clinic Sapporo Japan
9. Aoki Clinic Sapporo Japan
10. Biostatistics Section Clinical Research and Medical Innovation Center Hokkaido University Hospital Sapporo Japan
11. Division of Diabetes and Obesity Faculty of Medicine and Graduate School of Medicine Hokkaido University Sapporo Japan