1. Division of Rheumatology, Department of Internal Medicine, Keio University School of Medicine, Shinjuku-ku, Tokyo, Japan
2. Department of Allergy and Rheumatology, Graduate School of Medicine, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
3. Institute of Rheumatology, Tokyo Women's Medical University, Shinjuku-ku, Tokyo, Japan
4. Department of Orthopedic Surgery, Nagoya University Graduate School and Faculty of Medicine, Nagoya, Aichi, Japan
5. First Department of Internal Medicine, University of Occupational and Environmental Health, Japan, Kitakyushu, Fukuoka, Japan
6. Sasebo City General Hospital, Sasebo, Nagasaki, Japan
7. Research Division for Development of Anti-Infectious Agents, Institute of Development, Aging and Cancer, Tohoku University, Sendai, Miyagi, Japan
8. Division of Biostatistics and Clinical Epidemiology, University of Toyama School of Medicine, Toyama, Toyama, Japan
9. Department of Clinical Research and Development, UCB Japan Co., Ltd., Shinjuku-ku, Tokyo, Japan
10. Department of Medicine and Rheumatology, Graduate School of Medicine and Dentistry, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan
11. NTT Sapporo Medical Center, Sapporo, Hokkaido, Japan