1. Division of Rheumatology, Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
2. Division of Rheumatology, Department of Internal Medicine, Seoul National University Hospital, Department of Internal Medicine, Seoul, Korea
3. Division of Rheumatology, Department of Internal Medicine, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea
4. Division of Rheumatology, Department of Internal Medicine, Seoul University College of Medicine, Seoul, Korea
5. Division of Rheumatology, Department of Internal Medicine, Kangdong Sacred Heart Hospital, Seoul, Korea