1. Department of Endocrinology, Hematology, and Gerontology, Chiba University Graduate School of Medicine, Chiba, Japan
2. Department of Diabetes and Metabolism, Asahi General Hospital, Asahi, Chiba, Japan
3. Department of Metabolic Medicine, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan
4. Department of Dermatology, Gunma University Graduate School of Medicine, Maebashi, Japan
5. Department of Health Development and Medicine, Osaka University Graduate School of Medicine, Osaka, Japan
6. Department of Medicine, Division of Diabetes, Metabolism and Endocrinology, Atami Hospital, International University of Health and Welfare, Atami, Japan
7. Department of Orthopaedic Surgery, Nara Medical University, Nara, Japan
8. Geriatric and General Medicine, Osaka University, Osaka, Japan
9. Department of Dermatology, Sumitomo Hospital, Osaka, Japan
10. Department of Diabetes and Endocrinology, Daini Osaka Police Hospital, Osaka, Japan
11. Diabetes and Endocrinology, Saga-Ken Medical Centre Koseikan, Saga, Japan
12. Department of Dermatology, Showa General Hospital, Tokyo, Japan
13. Department of Community Healthcare and Geriatrics, Nagoya University Graduate School of Medicine, Nagoya, Japan
14. Department of Medicine, Division of Diabetes, Metabolism and Endocrinology, International University of Health and Welfare, Narita, Japan