1. Department of Medical Education, Dongguk University School of Medicine, 32 Dongguk-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 410-820, Korea;
2. Department of Medical Education, Jeju National University School of Medicine, Jeju, Korea;
3. Department of Emergency Medicine, Sooncheonhyang University School of Medicine, Bucheon, Korea