1. (2022, October 14). United Nations. World Population Ageing 2019. Highlights. Available online: https://www.un.org/en/development/desa/population/publications/pdf/ageing/WorldPopulationAgeing2019-Highlights.pdf.
2. (2022, October 18). World Health Organization. Available online: https://www.who.int/docs/default-source/documents/decade-of-health-ageing/decade-healthy-ageing-update-march-2019.pdf?sfvrsn=5a6d0e5c_2.
3. (2021, April 21). World Health Organization. Available online: https://www.who.int/news-room/questions-and-answers/item/healthy-ageing-and-functional-ability.
4. Chan, A.K.Y., Tamrakar, M., Jiang, C.M., Lo, E.C.M., Leung, K.C.M., and Chu, C.H. (2021). Common medical and dental problems of older people. Geriatrics, 6.
5. Periodontitis and diabetes: A two-way relationship;Preshaw;Diabetologia,2012