1. Division of Rheumatology, Department of Internal Medicine, Kangnam Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea.
2. Division of Rheumatology, Department of Internal Medicine, Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea.
3. Division of Allergy-Rheumatology, Department of Internal Medicine, Ajou University School of Medicine, Suwon, Korea.
4. Division of Rheumatology, Department of Internal Medicine, Inha University Hospital, Incheon, Korea.
5. Division of Rheumatology, Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
6. Division of Rheumatology, Department of Internal Medicine, Ewha Womans University Mokdong Hospital, Seoul, Korea.
7. Division of Rheumatology, Department of Internal Medicine, Dong-A University College of Medicine, Busan, Korea.
8. Division of Rheumatology, Department of Internal Medicine, KyungHee University Medical Center, KyungHee University, Seoul, Korea.
9. Division of Rheumatology, Department of Internal Medicine, Our Lady of Mercy Hospital, Catholic University of Korea, College of Medicine, Incheon, Korea.
10. Division of Rheumatology, Department of Internal Medicine, Gachon University of Medicine and Science, Gil Medical center, Incheon, Korea.
11. Division of Rheumatology, Department of Internal Medicine, Pundang Jesaeng General Hospital, Seongnam, Korea.
12. Division of Rheumatology, Department of Internal Medicine, NHIC Ilsan Hospital, Goyang, Korea.
13. Division of Rheumatology, Department of Internal Medicine, Keimyung University Dongsan Medical Center, Daegu, Korea.