1. Department of Emergency Medicine, Chonnam National University Hospital, Gwangju, Korea.
2. Department of Medicine, Chonnam National University, Gwangju, Korea.
3. Department of Emergency Medicine, Seoul National University Hospital, Seoul, Korea.
4. Department of Emergency Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea.
5. Department of Emergency Medicine, Seoul National University College of Medicine, Seoul, Korea.