1. Department of Internal Medicine, Inje University Seoul Paik Hospital, Inje University College of Medicine, Seoul, Korea
2. Department of Rheumatology, Keimyung University Dongsan Medical Center, Daegu, Korea
3. Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea
4. Department of Rheumatology, Hanyang University Hospital for Rheumatic Diseases, Seoul, Korea