1. Department of Community Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
2. Department of Infectious Disease, Sina Hospital, Hamadan University of Medical Sciences, Hamadan, Iran
3. Department of Pediatrics, Hamadan University of Medical Sciences, Hamadan, Iran
4. Department of Emergency Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
5. Department of Anesthesiology, Hamadan University of Medical Sciences, Hamadan, Iran
6. Department of Internal Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
7. Department of Health Services, School of Public Health, Iran University of Medical Sciences, Tehran, Iran