1. Research Center for Health Sciences, Hamadan University of Medical Sciences, Hamadan, Iran
2. Department of Epidemiology and Biostatistics, Tehran University of Medical Sciences, Tehran, Iran
3. Clinical Research Development Unit of Shahid Beheshti Hospital, Hamadan University of Medical Sciences, Hamadan, Iran
4. Psychosocial Health Research Institute, Iran University of Medical Sciences, Tehran, Iran
5. Department of Anesthesiology, AJA University of Medical Sciences, Tehran, Iran