1. Department of Clinical Research, NHO Tokyo National Hospital, 3-1-1 Takeoka, Kiyose 204-8585, Japan
2. Clinical Research Center for Allergy and Rheumatology, NHO Sagamihara National Hospital, 18-1 Sakuradai, Minami-ku, Sagamihara 252-0392, Japan
3. Department of Rheumatology, NHO Sagamihara National Hospital, 18-1 Sakuradai, Minami-ku, Sagamihara 252-0392, Japan
4. Department of Rheumatic Diseases, Tokyo Metropolitan Tama Medical Center, 2-8-29 Musashi-dai, Fuchu 183-8524, Japan
5. Division of Rheumatology, Department of Internal Medicine, Hyogo College of Medicine, 1-1 Mukogawa-cho, Nishinomiya 663-8501, Japan
6. Department of Nephrology, Sumitomo Hospital, 5-3-20 Nakanoshima, Kita-ku, Osaka 530-0005, Japan
7. Department of Rheumatology, Niigata Rheumatic Center, 1-2-8 Hon-cho, Shibata 957-0054, Japan
8. Department of Rheumatology, NHO Himeji Medical Center, 68 Hon-machi, Himeji 670-8520, Japan
9. Department of Rheumatology, Sakurajyuji Hospital, 1-1-1 Miyukikibe, Minami-ku, Kumamoto 861-4173, Japan
10. Department of Internal Medicine, NHO Nagoya Medical Center, 4-1-1 Sannomaru, Naka-ku, Nagoya 460-0001, Japan
11. Department of Orthopedics/Rheumatology, NHO Miyakonojo Medical Center, 5033-1 Iwayoshi-cho, Miyakonojo 885-0014, Japan
12. Tanimura Hospital, 10-2 Kitakoji, Nobeoka 882-0041, Japan
13. Tochigi Rheumatology Clinic, 1-1-9 Ekimaedori, Utsunomiya 321-0964, Japan
14. Clinical Research Center, NHO Nagasaki Medical Center, 2-1001-1 Kubara, Omura 856-8562, Japan
15. Department of Gastroenterology and Rheumatology, Fukushima Medical University School of Medicine, 1 Hikarigaoka, Fukushima 960-1295, Japan
16. Department of Rheumatology, Yokohama Minami Kyosai Hospital, 1-21-1 Rokuura-higashi, Kanazawa-ku, Yokohama 236-0037, Japan