1. Division of Rheumatology, Department of Internal Medicine, Korea University Guro Hospital, Seoul, Korea.
2. Division of Rheumatology, Department of Internal Medicine, Inje University College of Medicine, Seoul, Korea.
3. Department of Radiology, Hanyang University Hospital for Rheumatic Diseases, Seoul, Korea.
4. Department of Rheumatology, Hanyang University Hospital for Rheumatic Diseases, Seoul, Korea.