1. Division of Rheumatology, Department of Internal Medicine, Gachon University Gil Hospital, Incheon, Korea.
2. Division of Rheumatology, Department of Internal Medicine, NHIS Ilsan Hospital, Goyang, Korea.
3. Division of Rheumatology, Department of Internal Medicine, Inje University Ilsan Paik Hospital, Goyang, Korea.
4. Division of Rheumatology, Department of Internal Medicine, Ajou University School of Medicine, Suwon, Korea.
5. Division of Rheumatology, Department of Internal Medicine, Choong Ang University Hospital, Seoul, Korea.
6. Division of Rheumatology, Department of Internal Medicine, Inha University Hospital, Incheon, Korea.
7. Division of Rheumatology, Department of Internal Medicine, Korea University Ansan Hospital, Ansan, Korea.
8. Division of Rheumatology, Department of Internal Medicine, Ewha Womans University Medical Center, Seoul, Korea.
9. Division of Rheumatology, Department of Internal Medicine, SMG-SNU Boramae Medical Center, Seoul, Korea.
10. Department of Rheumatology, Hanyang University Hospital for Rheumatic Diseases, Seoul, Korea.