1. Department of Epidemiology, School of Health, Iran University of Medical Sciences, Tehran, Iran,
2. Health Policy Research Center, Shiraz University of Medical Sciences, Shiraz, Iran,
3. Department of Epidemiology, Research Center for Health Sciences, Shiraz University of Medical Sciences, Shiraz, Iran,
4. Department of Epidemiology, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran, and
5. Department of Public Health, School of Public Health, Neyshabur University of Medical Sciences, Neyshabur, Iran