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, Sapporo, Japan
3. Department of Surgical Pathology, Hokkaido University, Sapporo, Japan
4. Division of Diabetes and Obesity, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan