1. Werner C. The older population: 2010. The United States Census Bureau. Available at: http://www.census.gov/prod/cen2010/briefs/c2010br-09.pdf. (accessed December 18, 2011).
2. US Interim Projections by Age, Sex, Race, and Hispanic Origin: 2000-2050. The United States Census Bureau. Available at: http://www.census.gov/population/www/projections/usinterimproj/natprojtab02a.pdf (accessed October 17, 2011).
3. Retooling for an aging America: building the health care workforce,2008
4. National Alliance for Caregiving. Caregiving in the US: a focused look at those caring for someone age 50 or older. Available at: www.caregiving.org/data/FINALRegularExSum50plus.pdf (accessed March 2, 2012).
5. Future of cancer incidence in the United States: burdens upon an aging, changing nation;Smith;J Clin Oncol,2009