1. Department of Emergency Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
2. Department of Emergency Medicine, Dongguk University Ilsan Hospital, Goyang, Korea.
3. Department of Emergency Medicine, Pohang St. Mary’s Hospital, Pohang, Korea.
4. Department of Emergency Medical Services, Kyungdong University, Wonju, Korea.
5. Department of Emergency Medicine, Chuncheon Sacred Heart Hospital, Hallym University College of Medicine, Chuncheon, Korea.
6. Department of Emergency Medicine, Seoul National University College of Medicine, Seoul, Korea.