1. Department of Diabetes and Endocrinology Sapporo City General Hospital Sapporo Japan
2. Department of Rheumatology, Endocrinology and Nephrology Faculty of Medicine and Graduate School of Medicine Hokkaido University Sapporo Japan
3. Sapporo Medical Center NTT EC Sapporo Japan
4. Division of Diabetes and Obesity Faculty of Medicine and Graduate School of Medicine Hokkaido University Sapporo Japan