1. Division of Rheumatology, Department of Internal Medicine, Holy Family Hospital, College of Medicine, The Catholic University of Korea, Bucheon, Korea.
2. Division of Rheumatology, Department of Internal Medicine, St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
3. Department of Rehabilitation Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.
4. Department of Radiology, Holy Family Hospital, College of Medicine, The Catholic University of Korea, Bucheon, Korea.