1. Prehospital and Hospital Emergency Research Center, Tehran University of Medical Sciences, Tehran, Iran
2. Anesthesiology Department, Imam Khomeini Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran
3. Department of Epidemiology, School of Public Health and Safety, Shahid Beheshti University of Medical Sciences, Tehran, Iran
4. Department of Emergency Medicine, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
5. Department of Emergency Medicine, Shohadaye Tajrish Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran
6. Department of Emergency Medicine, Sina Hospital, Tehran University of Medical Sciences, Tehran, Iran