1. Undergraduate Course, Yonsei University College of Medicine, Seoul, Korea
2. Division of Rheumatology, Department of Internal Medicine, National Health Insurance Service Ilsan Hospital, Goyang, 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
5. Division of Endocrinology and Metabolism, Department of Internal Medicine, Hallym University Sacred Heart Hospital, Anyang, Korea