1 Department of Laboratory Medicine, Seoul National University Hospital, Seoul, Republic of Korea.
2 Department of Laboratory Medicine, Seoul National University Hospital, Seoul, Republic of Korea; Department of Laboratory Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea.
3 Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea.
4 Infection Control Office, Seoul National University Hospital, Seoul, Republic of Korea.
5 Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea; Infection Control Office, Seoul National University Hospital, Seoul, Republic of Korea. Electronic address: draver@snu.ac.kr.
6 Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea; Infection Control Office, Seoul National University Hospital, Seoul, Republic of Korea.