1. Department of Internal Medicine, Chungnam National University College of Medicine, Daejeon, Korea
2. Division of Rheumatology, Department of Internal Medicine, Bucheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
3. Division of Rheumatology, Department of Internal Medicine, Korea University Ansan Hospital, Ansan, Korea
4. Division of Rheumatology, Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea
5. Division of Rheumatology, Department of Internal Medicine, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
6. Division of Rheumatology, Department of Internal Medicine, Daegu Catholic University School of Medicine, Daegu, Korea
7. Department of Rheumatology, Hanyang University Hospital for Rheumatic Diseases, Seoul, Korea
8. Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
9. Department of Internal Medicine, Wonkwang University Hospital, Iksan, Korea
10. Department of Internal Medicine, Kyungpook National University School of Medicine, Daegu, Korea
11. Division of Rheumatology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
12. Department of Rheumatology, Chonnam National University Hospital, Gwangju, Korea
13. Division of Rheumatology, Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
14. Department of Rheumatology, Ajou University School of Medicine, Suwon, Korea
15. Division of Rheumatology, Department of Internal Medicine, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea