1. Department of Emergency Medicine, College of Medicine, Soonchunhyang University, Cheonan 31151, Republic of Korea
2. Department of Emergency Medicine, School of Medicine, Chungnam National University, Daejeon 35015, Republic of Korea
3. Division of Emergency Medicine, Department of Medicine, The Catholic University of Korea, Seoul 11765, Republic of Korea
4. Department of Emergency Medicine, College of Medicine, Yeungnam University, Daegu 42415, Republic of Korea