1. Department of Emergency Medicine, College of Medicine, Chung-Ang University Gwangmyeong Hospital, Seoul, Chung-Ang University, Gwangmyeong-si, Republic of Korea
2. Department of Emergency Medicine, College of Medicine, Ewha Womans University Mokdong Hospital, Ewha Womans University, Seoul, Republic of Korea
3. Graduate Student, Graduate School, College of Nursing, Ewha Womans University, Seoul, Republic of Korea