1. Department of Rheumatology, Endocrinology and Nephrology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo 060-8638, Hokkaido, Japan
2. Caress Sapporo Hokko Memorial Clinic, Sapporo 065-0027, Hokkaido, Japan
3. Manda Memorial Hospital, Sapporo 060-0062, Hokkaido, Japan