1. Major trends in population growth around the world;Gu;China CDC weekly,2021
2. Department of Economic and Social Affairs, Population Division, World Population Prospects 2019;Nations,2019
3. An Aging World: 2015;He,2016
4. Findings of the 2016 National Population and Housing Census Iran;Iran,2017
5. Association between social support and quality of life of relative caregivers of elderly dependents;Anjos;Ciência Saúde Coletiva,2015