1. Department of Emergency Medicine, Hallym University Dongtan Sacred Heart Hospital, Hwaseong, Korea.
2. Genome Epidemiology, Department of Epidemiology, Graduate School of Public Health, Seoul National University, Seoul, Korea.
3. Department of Emergency Medicine, Myoungji Hospital, Goyang, Korea.
4. Laboratory of Emergency Medical Services, Bio-Medical Research Institute, Seoul National University Hospital, Seoul, Korea.
5. Department of Preventive Medicine, Graduate School of Public Health, Seoul National University, Seoul, Korea.
6. Korea Institute for Health and Social Affairs, Cheongju, Korea.