1. Congressional Budget Office. The 2016 Long-Term Budget Outlook. 2015. Available at: https://www.cbo.gov/publication/51580 . Accessed 2 Nov 2017.
2. Medicare Payment Advisory Commission. Report to the Congress: Medicare Payment Policy. Washington, DC: Medicare Payment Advisory Commission; 2017.
3. Pallin DJ, Espinola JA, Camargo CA Jr. US population aging and demand for inpatient services. J Hosp Med. 2014;9(3):193–6.
4. Weiss AJ, Elixhauser A. Overview of Hospital Stays in the United States, 2012. HCUP Statistical Brief #180. 2014. Agency for Healthcare Research and Quality, Rockville, MD. Available at: https://www.hcup-us.ahrq.gov/reports/statbriefs/sb180-Hospitalizations-United-States-2012.pdf . Accessed 2 Nov 2017.
5. Fisher ES, Wennberg DE, Stukel TA, Gottlieb DJ. Variations in the longitudinal efficiency of academic medical centers. Health Aff (Millwood). 2004;Suppl Variation:VAR19–32.