1. Department of Emergency Medicine, Dongsan Medical Center, Keimyung University School of Medicine, Daegu, Republic of Korea
2. Department of Emergency Medicine, Chung-Ang University Gwangmyeong Hospital, Gwangmyeong-si, Gyeonggi-do, Republic of Korea
3. Department of Emergency Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
4. Department of Emergency Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Republic of Korea
5. Department of Medical Education, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.