1. http://www.efmoody.com/estate/lifeexpectancy.html 2010
2. Centers for Disease Control and Prevention http://www.cdc.gov/nchs/hdi.htm 2010
3. The decline in US cancer mortality in people born since 1925;Kort;Cancer Res,2009
4. World Health Organization 2009 http://whqlibdoc.who.int/publications/2009/9789241563819_eng.pdf