1. Department of Internal Medicine, Inje University Ilsan Paik Hospital, Goyang, Korea.
2. Department of Infectious Diseases, Ajou University School of Medicine, Suwon, Korea.
3. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
4. Infection Control Office, Inje University Sanggye Paik Hospital, Seoul, Korea.
5. Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
6. Department of Internal Medicine, Seoul National University College of Medicine, Seoul Korea.,
7. Department of Nursing, Soonchunhyang University College of Medicine, Cheonan, Korea.
8. Department of Internal Medicine, Kyung Hee University School of Medicine, Seoul, Korea.
9. Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea.
10. Infection Control Office, Korea University Guro Hospital, Seoul, Korea.
11. Department of Internal Medicine, Soonchunhyang University College of Medicine, Seoul, Korea.
12. Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.
13. Infection Control Office, The Catholic University of Korea St. Vincent's Hospital, Suwon, Korea.
14. Department of Pediatrics, Eulji University School of Medicin, Seoul, Korea.
15. Infection Control Office, Seoul National University Bundang Hospital, Seongnam, Korea.
16. Infection Control Team, Chungang University Hospital, Seoul, Korea.
17. Division of Infectious Disease Control, Korea Centers for Disease Control and Prevention, Osong, Korea.
18. Department of Laboratory Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea.