1. Department of Internal Medicine, Yongin Severance Hospital, Yonsei University College of Medicine, Yongin, Korea
2. Department of Medical Science, BK21 Plus Project, Yonsei University College of Medicine, Seoul, Korea
3. Division of Rheumatology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
4. Institute for Immunology and Immunological Diseases, Yonsei University College of Medicine, Seoul, Korea