1. Department of Emergency Medicine, School of Medicine, Kyungpook National University, Daegu, South Korea
2. Department of Emergency Medicine, CHA Gumi Medical Center, CHA University, Gumi, South Korea
3. Department of Emergency Medicine, Dongguk University Ilsan Hospital, College of Medicine, Dongguk University, Seoul, South Korea
4. Department of Emergency Medicine, Kyung Hee Medical Center, Kyung Hee University, Seoul, South Korea
5. Department of Emergency Medicine, Nowon Eulji Medical Center, Eulji University, Seoul, South Korea