World Population Ageing 2019. United Nations, Department of Economic and Social Affairs, Population Division (2020).
Ortman, J. M., Velkoff, V. A., & Hogan, H. An Aging Nation: The Older Population in the United States, Current Population Reports. U.S. Census Bureau, 25–1140 (2014).
Hung, M. et al. Health and dental care expenditures in the United States from 1996 to 2016. PLoS One 15, e0234459 (2020).
Douglass, C. W. & Shanmugham, J. R. Primary care, the dental profession, and the prevalence of chronic diseases in the United States. Dent. Clin. North Am. 56, 699–730 (2012).
Brookmeyer, R., Abdalla, N., Kawas, C. H. & Corrada, M. M. Forecasting the prevalence of pre-clinical and clinical Alzheimer’s disease in the united states. Alzheimer’s Dement. 14, 121–129 (2018).