1. Division of Rheumatology, Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
2. Department of Rheumatology, Hanyang University Hospital for Rheumatic Diseases, Seoul, Korea.
3. Department of Internal Medicine, Chungnam National University School of Medicine, Daejeon, Korea.
4. Department of Internal Medicine, Jeju National University Hospital, Jeju, Korea.
5. Department of Pediatrics, Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Korea.
6. Division of Rheumatology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
7. Division of Rheumatology, Department of Internal Medicine, Wonkwang University Hospital, Iksan, Korea.
8. Division of Rheumatology, Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea.
9. Division of Rheumatology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.
10. Division of Rheumatology, Department of Internal Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
11. Division of Rheumatology, Department of Internal Medicine, Arthritis and Autoimmunity Research Center, Catholic University of Daegu School of Medicine, Daegu, Korea.
12. Department of Rheumatology, Chonnam National University Medical School and Hospital, Gwangju, Korea.
13. Department of Urology, Hanyang University Guri Hospital, Guri, Korea.