1. U.S. Census Bureau. Table 2. Annual estimates of the resident population by sex and selected age groups for the United States: April 1, 2000 to July 1, 2009 (NC-EST2009-02). U.S. Census Bureau, Population Division. Release date: June 2010.
2. U.S. Census Bureau. Table 2. Projections of the population by selected age groups and sex for the United States: 2010-2050 (NP2008-T2), Source: Population Division, U.S. Census Bureau. Release date: August 14, 2008.
3. Deaths: preliminary data for 2009;Kochanek;National Vital Statistics Report,2011
4. Demographics and cardiology, 1950-2050;Foot;J Am Coll Cardiol,2000
5. Forecasting the future of cardiovascular disease in the United States: a policy statement from the American Heart Association;Heidenreich;Circulation,2011