1. Department of Emergency Medicine, Seoul National University Boramae Medical Center, Seoul, Korea.
2. Department of Emergency Medicine, Seoul National University College of Medicine, Seoul, Korea.
3. Department of Emergency Medicine, Dongguk University College of Medicine, Goyang, Korea.
4. Department of Emergency Medicine, Jeju National University School of Medicine, Jeju, Korea.
5. Department of Emergency Medicine, Soonchunhyang University Seoul Hospital, Seoul, Korea.
6. Department of Emergency Medicine, Gyeongsang National University School of Medicine, Jinju, Korea.