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-si Korea
3. Division of Rheumatology; Department of Internal Medicine; Inje University Ilsan Paik Hospital; Ilsan 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; Incehon Korea
9. Division of Rheumatology; Department of Internal Medicine; SNU Boramae Medical Center; Seoul Korea