1. Department of Medicine, The Graduate School, Yonsei University College of Medicine, Seoul, Korea.
2. Hospital Medicine Center, Seoul National University Bundang Hospital, Seongnam, Korea.
3. Department of Laboratory Medicine, Yonsei University College of Medicine, Seoul, Korea.
4. Research Institute of Bacterial Resistance, Yonsei University College of Medicine, Seoul, Korea.
5. Division of Rheumatology, Department of Internal Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.