1. Division of Rheumatology, Department of Internal Medicine, Chungbuk National University Hospital, Cheongju, Korea
2. Division of Rheumatology, Department of Internal Medicine, School of Medicine, Kyung Hee University, Seoul, Korea
3. Division of Rheumatology, Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
4. Department of Medical Device Development, Seoul National University Graduate School, Seongnam, Korea