Affiliation: | 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 |