1. Department of Public Health, Student Research Committee, Esfarayen Faculty of Medical Sciences, Esfarayen, Iran
2. Iranian Research Center on Aging, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
3. Semelghan Health Center, North Khorasan University of Medical Sciences, Bojnurd, Iran
4. Department of Health Education and Promotion, School of Public Health, Iran University of Medical Sciences, Tehran, Iran