1. Alzheimer Disease Facts and Figures 2013. www.alz.org.
2. U.S. Surgeon General Office. www.surgeongeneral.gov/library/mentalhealth/chapter5/sec1.html.
3. Center for Medicare and Medicaid Services - Geographic Variation Public Use. www.cms.gov/Research-Statistics-Data-and-Systems/Statistics-Trends-and-Reports/Medicare-Geographic-Variation/index.html.
4. United States Census Bureau. Annual projections of the resident population by age, sex, race and hispanic origin: lowest, middle, highest series and zero international migration series, 1999 to 2100. www.census.gov/population/projections/data/national/np-d1.html.