1. Department of Internal Medicine, Soonchunhyang University, Asan, Korea
2. Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea
3. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
4. Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seoul, Korea
5. Department of Internal Medicine, Ewha Womans University School of Medicine, Seoul, Korea
6. Department of Laboratory Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
7. Department of Internal Medicine, Pusan National University Hospital, Pusan National University School of Medicine, Pusan, Korea
8. Department of Laboratory Medicine, Keimyung University School of Medicine, Daegu, Korea
9. Department of Nursing, Soonchunhyang University, Cheonan, Korea
10. Infection Control Team, Seoul National University Bundang Hospital, Seongnam, Korea
11. Infection Control Team, Korea University Ansan Hospital, Ansan, Korea
12. Infection Control Office, Ewha Womans University Mokdong Hospital, Seoul, Korea
13. Infection Control Team, Korea University Guro Hospital, Seoul, Korea
14. Infection Control Team, Daejeon Eulji Medical Center, Eulji University, Daejeon, Korea
15. Infection Control Team, National Health Insurance Service Ilsan Hostpial, Goyang, Korea