1. Department of Rheumatology, Endocrinology and Nephrology, Faculty of Medicine and Graduate School of MedicineHokkaido University Sapporo Japan
2. Department of Orthopaedic Surgery, Faculty of Medicine and Graduate School of MedicineHokkaido University Sapporo Japan
3. Department of Nephrology, Japan Community Health Care OrganizationSapporo Hokushin Hospital Sapporo Japan
4. Department of NephrologyHokkaido Medical Center Sapporo Japan
5. Department of HemodialysisHokko Memorial Hospital Sapporo Japan
6. Department of HemodialysisOgasawara Memorial Sapporo Hospital Sapporo Japan