1. Division of Rheumatology, Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea.
2. Division of Rheumatology, Department of Internal Medicine, SMG-SNU Boramae Medical Center, Seoul, Korea.
3. Division of Rheumatology, Department of Internal Medicine, Chonnam National University Hospital, Gwangju, Korea.
4. Division of Rheumatology, Department of Internal Medicine, Dong-A University Hospital, Busan, Korea.
5. Division of Rheumatology, Department of Internal Medicine, Ewha Womans University Mokdong Hospital, Seoul, Korea.
6. Division of Rheumatology, Department of Internal Medicine, Konkuk University Medical Center, Seoul, Korea.
7. Division of Rheumatology, Department of Internal Medicine, Chungnam National University Hospital, Daejeon, Korea.
8. Division of Rheumatology, Department of Internal Medicine, Ajou University Hospital, Suwon, Korea.
9. Division of Rheumatology, Department of Internal Medicine, Kyung Hee University Medical Center, Seoul, Korea.
10. Division of Rheumatology, Department of Internal Medicine, Kyung Hee University Hospital at Gangdong, Seoul, Korea.
11. Division of Rheumatology, Department of Internal Medicine, Daegu Catholic University Medical Center, Daegu, Korea.
12. Department of Molecular Medicine and Biopharmaceutical Sciences, Graduate School of Convergence Science and Technology, and College of Medicine, Medical Research Center, Seoul National University, Seoul, Korea.