1. Division of Rheumatology, Department of Internal Medicine, Faculty of Medicine, Toho University, Tokyo, Japan
2. Department of Internal Medicine, Juntendo University Koshigaya Hospital, Juntendo University School of Medicine, Saitama, Japan
3. Department of Internal Medicine and Rheumatology, Juntendo University School of Medicine, Tokyo, Japan
4. Department of Orthopaedic Surgery, Saitama Medical University, Saitama, Japan
5. Center for Rheumatology, Department of Internal Medicine, Okayama Saiseikai General Hospital, Japan
6. Department of Orthopaedic Biomaterial Science, Osaka University Graduate School of Medicine, Osaka, Japan