1. Department of Emergency Medicine, Chonnam National University Medical School, Chonnam National University Hospital, Gwangju, Republic of Korea.
2. Department of Emergency Medicine, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul, Republic of Korea.
3. Department of Emergency Medicine, Ulsan University College of Medicine, Asan Medical Center, Seoul, Republic of Korea.
4. Department of Emergency Medicine, College of Medicine, Korea University, Seoul, Republic of Korea.