1. Division of Rheumatology, Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan
2. Institute of Rheumatology, Tokyo Women's Medical University, Tokyo, Japan
3. First Department of Internal Medicine, University of Occupational and Environmental Health, Fukuoka, Japan
4. Inoue Hospital, Gunma, Japan
5. Kagoshima Red Cross Hospital, Kagoshima, Japan
6. Data center, Product development, Celltrion, Inc., Incheon, Republic of Korea
7. Pharmaceutical Development Division, Pharmaceuticals Group, Nippon Kayaku Co., Ltd., Tokyo, Japan