1. United Nations, Department of Economic and Social Affairs, Population Division (2017). World Population Ageing 2017 - Highlights (ST/ESA/SER.A/397).
2. World Report on Ageing and Health,2015
3. Population aging and cancer: a cross-national concern;Yancik;Cancer J,2005
4. Future of cancer incidence in the United States: burdens upon an aging, changing nation;Smith;J Clin Oncol,2009
5. National Cancer Intelligence Network. Older people and cancer. Public Health England. Available at: www.ncin.org.uk/view?rid=2950 (Accessed 01.11.2018). Older people and cancer.