1. Department of Gerontology, University of Social Welfare and Rehabilitation, Tehran, Iran
2. Department of Community Health, School of Nursing and Midwifery, Guilan University of Medical Sciences, Rasht, Iran
3. School of Nursing and Midwifery, Shahid Beheshti University of Medical Sciences, Tehran, Iran
4. Academic Center of Education, Culture and Research, Iranian Institute for Health Sciences Research, Tehran, Iran