1. Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea.
2. Department of Internal Medicine, Inje University Ilsan Paik Hospital, Inje University Collee of Medicine, Goyang, Korea.
3. Department of Radiology, Hanyang University College of Medicine, Seoul, Korea.
4. Department of Rheumatology, Hanyang University Hospital for Rheumatic Diseases, Seoul, Korea.