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"(AP) &amp;amp;#151; Vice presidential candidate Paul Ryan introduced his 78-year-old mother to voters Saturday as he defended the Republican ticket from withering criticism from President Barack Obama for proposals to overhaul the government's popular Medicare program that provides health care coverage to seniors."^^<http://www.w3.org/2001/XMLSchema#string>
<http://medicalxpress.com/news/2012-08-medicare-focus-obama-ryan.html>