1. Department of Internal Medicine; Soonchunhyang University Hospital Bucheon; Bucheon; Gyeonggi-do; Korea
2. Department of Rheumatology; Bundang Jesaeng Hospital; Seongnam; Gyeonggi-do; Korea
3. Department of Internal Medicine; Hallym University Sacred Heart Hospital; Anyang; Gyeonggi-do; Korea
4. Hanyang University Hospital for Rheumatic Diseases; Seoul; Korea
5. Department of Medicine; Samsung Medical Center; Sungkyunkwan University School of Medicine; Seoul; Korea
6. Division of Rheumatology; Department of Internal Medicine; Institute for Immunology and Immunological Diseases; Yonsei University College of Medicine; Seoul; Korea