1. Department of Rheumatology, Hanil General Hospital, Seoul, Republic of Korea
2. Department of Rheumatology, St. Vincent’s Hospital, The Catholic University of Korea, Suwon, Republic of Korea
3. Clinical Research Center for Rheumatoid Arthritis (CRCRA), Seoul, Republic of Korea
4. Department of Rheumatology, Hanyang University Hospital for Rheumatic Diseases, Seoul, Republic of Korea