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https://www.oecd.org/unitedstates/Country-Note-UNITED%20STATES-OECD-Health-Statistics-2015.pdf
. Accessed 17 Nov 2017.
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https://www.cms.gov/Research-Statistics-Data-and-Systems/Statistics-Trends-and-Reports/NationalHealthExpendData/Downloads/HistoricalNHEPaper.pdf
. Accessed 17 Nov 2017.
3. The Boards of Trustees of the Federal Hospital Insurance and Federal Supplementary Medical Insurance Trust Funds. Annual Report of the Boards of Trustees of the Federal Hospital Insurance and Federal Supplementary Medical Insurance Trust Funds. 2016.
https://www.cms.gov/Research-Statistics-Data-and-Systems/Statistics-Trends-and-Reports/ReportsTrustFunds/Downloads/TR2016.pdf
. Accessed 24 Nov 2017.
4. Congressional Budget Office. Historical budget data, March 2016, and long-term budget projections, July 2016.
https://www.cbo.gov/about/products/budget-economic-data
. Accessed 10 Feb 2017.
5. Centers for Medicare Services and Medicaid Services National Health Expenditures Fact Sheet, December 6, 2017.
https://www.cms.gov/research-statistics-data-and-systems/statistics-trends-and-reports/nationalhealthexpenddata/nhe-fact-sheet.html
. Accessed 21 Dec 2017.