1. Framing the issue of ageing and health care spending in Canada, the United Kingdom and the United States
2. 18. American Statistical Association. World population likely to surpass 11 billion in 2100: US population projected to grow by 40 percent over next 85 years, 2015, available at www.sciencedaily.com/releases/2015/08/150810110634.htm (accessed February 10, 2015).
3. 41. Centers for Medicare and Medicaid Services. Medicare data for the geographic variation: a methodological overview, 2010, available at www.cms.gov/research-statistics-data-and-systems/statistics-trends-and-reports/medicare-geographic-variation/downloads/geo_var_puf_methods_paper.pdf (accessed January 29, 2016).
4. 4. Center for Diseases Control and Prevention. Deaths: final data for 2013, 2016, available at www.cdc.gov/nchs/data/hus/hus14.pdf–016 (accessed February 21, 2016).
5. Multimorbidity in general practice: prevalence, incidence, and determinants of co-occurring chronic and recurrent diseases;Akker;J Clin Epidemiol,1998