1. Division of Rheumatology, Department of Internal Medicine, Gil Medical Center, Gachon University College of Medicine, Incheon, Korea.
2. Division of Rheumatology, Department of Internal Medicine, Daegu Fatima Hospital, Daegu, Korea.
3. Department of Internal Medicine, Kangwon National University School of Medicine, Chuncheon, Korea.
4. Department of Rheumatology, Hanyang University Hospital for Rheumatic Diseases, Seoul, Korea.
5. Department of Internal Medicine, Kangdong Sacred Heart Hospital, Seoul, Korea.
6. Division of Rheumatology, Department of Internal Medicine, Eunpyeong St. Mary's Hospital, The Catholic University of Korea, Seoul, Korea.
7. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
8. Division of Rheumatology, Department of Internal Medicine, Ewha Womans University College of Medicine, Seoul, Korea.
9. Division of Rheumatology, Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
10. Department of Medical Humanities, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
11. Division of Rheumatology, Department of Internal Medicine, National Medical Center, Seoul, Korea.
12. Uhm's Hanyang Rheumatism Clinic, Seoul, Korea.
13. Division of Rheumatology, Department of Internal Medicine, Wonkwang University Hospital, Iksan, Korea.
14. Hanyang Clinic, Seoul, Korea.
15. Department of Internal Medicine, Seoul Medical Center, Seoul Metropolitan Government, Seoul, Korea.
16. Division of Rheumatology, Department of Internal Medicine, Kyung Hee University Medical Center, Kyung Hee University, Seoul, Korea.