1. Department of Rheumatology, Ome Municipal General Hospital , Ome, Japan
2. Department of Rheumatology, Tokyo Medical and Dental University (TMDU) , Tokyo, Japan
3. Department of Rheumatology and Clinical Immunology, Saitama Medical Center, Saitama Medical University , Kawagoe, Japan
4. Division of Hematology, Rheumatology and Respiratory Medicine, Department of Internal Medicine, Faculty of Medicine, Kagawa University , Kagawa, Japan
5. Division of Rheumatology, Department of Internal Medicine, St. Marianna University School of Medicine , Kawasaki, Japan
6. Department of Nephrology, Rheumatology, Endocrinology and Metabolism, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences , Okayama, Japan
7. Department of Clinical Epidemiology, Kochi Medical School, Kochi University , Nankoku, Japan
8. Department of Nephrology and Rheumatology, Kyorin University School of Medicine , Tokyo, Japan
9. Center for Rheumatology, Department of Internal Medicine, Okayama Saiseikai General Hospital , Okayama, Japan
10. Department of Rheumatology, Endocrinology and Nephrology, Graduate School of Medicine and Faculty of Medicine, Hokkaido University , Sapporo, Japan
11. Division of Nephrology and Dialysis, Kitano Hospital, The Tazuke Kofukai Medical Research Institute , Osaka, Japan
12. Department of Nephrology and Rheumatology, Iwate Prefectural Central Hospital , Morioka, Japan
13. Division of Rheumatology, Department of Internal Medicine, School of Medicine, Keio University , Tokyo, Japan
14. Internal Medicine III, Shimane University Faculty of Medicine , Izumo, Shimane, Japan
15. Department of Medicine and Rheumatology, Tokyo Metropolitan Geriatric Hospital , Tokyo, Japan
16. Department of Hematology, Nephrology, and Rheumatology, Akita University Graduate School of Medicine , Akita, Japan
17. Department of Internal Medicine, Faculty of Medicine, University of Tsukuba , Ibaraki, Japan
18. Department of Allergy and Clinical Immunology, Chiba University Hospital , Chiba, Japan
19. Department of Internal Medicine and Rheumatology, Juntendo University Faculty of Medicine , Tokyo, Japan
20. Department of Nephrology, School of Medicine, Tokyo Women’s Medical University , Tokyo, Japan
21. Department of Nephrology and Rheumatology, Aichi Medical University , Nagakute, Japan
22. Department of Nephrology, Shiga General Hospital , Moriyama, Japan
23. Division of Rheumatology, Department of Internal Medicine, Tokyo Women’s Medical University School of Medicine , Tokyo, Japan
24. Department of Internal Medicine, Kichijoji Asahi Hospital , Tokyo, Japan