1. Department of Emergency Medicine, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul, South Korea
2. Laboratory of Emergency Medical Services, Seoul National University Hospital Biomedical Research Institute, Seoul, South Korea
3. Department of Emergency medicine, Dongguk University Ilsan Hospital, Goyang-si, South Korea
4. Department of Emergency Medicine, Seoul National University Hospital
5. Department of Emergency Medicine, Jeju National University College of Medicine
6. Department of Emergency Medicine, Gyeongsang National University Hospital, Jinju, South Korea