1. Department of Orthopaedic Surgery, Faculty of Medicine, The University of Tokyo, Tokyo, Japan;
2. First Department of Internal Medicine, University of Occupational and Environmental Health, Fukuoka, Japan;
3. Department of Orthopaedic Surgery, Nagoya University Graduate School of Medicine, Aichi, Japan;
4. Institute of Rheumatology, Tokyo Women’s Medical University, Tokyo, Japan;
5. Division of Rheumatology, Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan