1. Division of Infectious Diseases, Department of Internal Medicine, Kangnam Sacred Heart Hospital, College of Medicine, Hallym University, Seoul, Korea.
2. Division of Infectious Disease, Department of Internal Medicine, Gil Medical Center, Gachon University College of Medicine, Incheon.
3. Department of Laboratory Medicine, Kangnam Sacred Heart Hospital, College of Medicine, Hallym University, Seoul, Korea.
4. Department of Critical Care Medicine, Samsung Medical Center, School of Medicine, Sungkyunkwan University, Seoul, Korea.
5. Department of Infection Control, Korea University Guro Hospital, Seoul, Korea.
6. Department of Infection Control, Ewha Womens University Mokdong Hospital, Seoul, Korea.
7. Department of Infection Control, Kangnam Severance Hospital, Seoul, Korea.