1. United Nations, Department of Economic and Social Affairs, Population Division. World Population Ageing 2019: Highlights. 2019. https://www.un.org/en/development/desa/population/publications/pdf/ageing/WorldPopulationAgeing2019-Highlights.pdf. Assessed 21 January 2020.
2. Hales CM, Servais J, Martin CB, Kohen D. Prescription drug use among adults aged 40–79 in the United States and Canada. Centers for Disease Control and Prevention, National Center for Health Statistics. 2019. https://www.cdc.gov/nchs/data/databriefs/db347-h.pdf. Assessed 27 January 2020.
3. Canadian Institute for Health Information. Drug Use Among Seniors in Canada, 2016. 2018. https://www.cihi.ca/sites/default/files/document/drug-use-among-seniors-2016-en-web.pdf. Assessed 30 May 2019.
4. Yap AF, Thirumoorthy T, Kwan YH. Medication adherence in the elderly. J Clin Gerontol Geriatrics. 2016;7(2):64–7.
5. World Health Organization. Adherence to long-term therapies: Evidence for action. 2003. https://www.who.int/chp/knowledge/publications/adherence_report/en/. Accessed 18 Feb 2020.