1 Division of Rheumatology, Department of Internal Medicine, Konkuk University Medical Center, Seoul, Korea.
2 Division of Rheumatology, Department of Internal Medicine, Research Institute of Medical Science, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul, Korea. kimhaerim@kuh.ac.kr.
3 Division of Rheumatology, Department of Internal Medicine, Research Institute of Medical Science, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul, Korea.