1. Department of Public Health, School of Health, Ardabil University of Medical Sciences, Ardabil, Iran
2. Department of Public Health, School of Public Health, Bushehr University of Medical Sciences, Bushehr, Iran
3. Health Research Center, Life Style Institute, Baqiyatollah University of Medical Sciences, Tehran, Iran
4. Department of Epidemiology, Shahroud University of Medical Sciences, Shahroud, Iran
5. Department of Epidemiology, School of Health, Iran University of Medical Sciences, Tehran, Iran