1 Department of Emergency Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.
2 Laboratory of Emergency Medical Services, Seoul National University Hospital Biomedical Research Institute, Seoul, Korea.
3 Disaster Medicine Research Center, Seoul National University Medical Research Center, Seoul, Korea.
4 Department of Emergency Medicine, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul National University College of Medicine, Seoul, Korea.