1. Department of Rheumatology, Ajou University School of Medicine, Suwon, Korea.
2. Division of Rheumatology, Department of Internal Medicine, Ewha Womans University School of Medicine, Seoul, Korea.
3. Division of Rheumatology, Department of Internal Medicine, Kwandong University College of Medicine Myongji Hospital, Goyang, Korea.
4. Division of Rheumatology, Department of Internal Medicine, Keimyung University Dongsan Medical Center, Daegu, Korea.
5. Division of Rheumatology, Department of Internal Medicine, NHIC Ilsan Hospital, Ilsan, Korea.
6. Division of Rheumatology, Department of Internal Medicine, Gachon University Gil Hospital, Incheon, Korea.
7. Division of Rheumatology, Department of Internal Medicine, Inha University Hospital, Incheon, Korea.
8. Division of Rheumatology, Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea.
9. Division of Rheumatology, Department of Internal Medicine, Catholic University of Korea, Incheon St. Mary's Hospital, Incheon, Korea.
10. Madisarang Rheumatology Clinic, Seoul, Korea.