1. Mazandaran University of Medical Sciences, School of Health, Department of Geriatric Health, Sari, Iran
2. Academic Center for Education, Culture and Research (ACECR), Health Education Research Group, Khuzestan, Ahvaz, Iran
3. Iranian Research Center on Ageing, University of Social Welfare and Rehabilitation, Tehran, Tehran, Iran
4. Department of Epidemiology & Biostatics, School of Public Health, Tehran University of Medical Sciences, Tehran, Tehran, Iran
5. Behbahan Faculty of Medical Sciences, Behbahan, Iran