1. Department of Pediatrics, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, the Republic of Korea.
2. Infection Control Team, Seoul National University Bundang Hospital, Seongnam, the Republic of Korea.
3. Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, the Republic of Korea.
4. Department of Laboratory Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, the Republic of Korea.