1. Department of Rheumatology, Tokyo Medical University Ibaraki Medical Center,
3-20-1 Amimachi-chuo, Inashiki, Ibaraki 300-0395, Japan
2. Nishino Clinic of Orthopedics and Rheumatology,
Tokyo 115-0056, Japan
3. Department of Rheumatology, Clinical Research Center for Allergy and Rheumatology, Sagamihara National Hospital, National Hospital Organization,
Kanagawa 228-8522, Japan
4. Department of Orthopaedic Surgery, Faculty of Medicine, The University of Tokyo,
7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan