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. Manda Memorial Hospital, Sapporo, Japan.
4. Kurihara Clinic, Sapporo, Japan.
5. Aoki Clinic, Sapporo, Japan.
6. Division of Diabetes and Obesity, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan.