1. U.S. Department of Health and Human Services Administration on Aging. Available at: http://www.aoa.gov/Aging_Statistics/Profile/2013/2.aspx. Accessed November 17, 2014.
2. The state of aging and health in America 2013;Centers for Disease Control and Prevention,2013
3. U.S. Department of Health and Human Services Administration on Aging. Available at: http://www.aoa.acl.gov/Aging_Statistics/Profile/2013/3.aspx. Accessed November 17, 2014.
4. The aging population and its impact on the surgery workforce;Etzioni;Ann Surg,2003
5. The redefinition of aging in American surgery;Neuman;Milbank Q,2013