1. Department of Emergency Medicine, Chungnam National University College of Medicine, Daejeon, Korea.
2. Department of General Surgey, Tongyeong Segyero Hospital, Tongyeong, Korea.
3. Department of Emergency Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea.
4. Department of Emergency Medicine, Ajou University College of Medicine, Suwon, Korea.