1. Department of Internal Medicine, Inje University Ilsan Paik Hospital, Goyang, Korea
2. Infection Control Office, Inje University Ilsan Paik Hospital, Goyang, Korea
3. Department of Infectious Diseases, Ajou University School of Medicine, Suwon, Korea
4. Infection Control Office, Korea University Guro Hospital, Seoul, Korea
5. Department of Nursing, Soonchunhyang University College of Medicine, Cheonan, Korea
6. Department of Nursing, The Catholic University of Korea College of Nursing, Seoul, Korea
7. Infection Control Office, Inje University Sanggye Paik Hospital, Seoul, Korea
8. Infection Control Team, Chungang University Hospital, Seoul, Korea
9. Infection Control Office, Seoul National University Bundang Hospital9, Sungnam, Korea