1. Department of Emergency Medicine, Inha University Hospital, Inha University College of Medicine, Incheon, Korea.
2. Department of Otolaryngology, Soonchunhyang University Bucheon Hospital, Soonchunghyang University College of Medicine, Bucheon, Korea.
3. Department of Pediatrics, Soonchunhyang University Bucheon Hospital, Soonchunghyang University College of Medicine, Bucheon, Korea.