1. Department of Emergency Medicine, Chonnam National University Hospital, Gwangju, Korea.
2. Department of Emergency Medicine, Seoul National University Hospital, Seoul, Korea.
3. Department of Emergency Medicine, College of Medicine, Chonnam National University, Gwangju, Korea.
4. Department of Emergency and Critical Care Medicine, Kansai Medical University, Osaka, Japan.
5. Department of Emergency Medicine, College of Medicine, Seoul National University, Seoul, Korea.