1. Department of Neurosurgery, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
2. Department of Critical Care Medicine, Seoul National University Hospital, Seoul, Korea.
3. Department of Neurosurgery, Seoul National University Hospital, Seoul, Korea.
4. Department of Neurosurgery, Incheon St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Incheon, Korea.
5. Center for Infection Control and Prevention, Seoul National University Hospital, Seoul, Korea.
6. Department of Nursing, Seoul National University Hospital, Seoul, Korea.
7. Department of Nursing, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea.
8. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.