Stock Photo - United States Senator John McCain (Republican of Arizona) makes remarks at a press conference to discuss the observational study on the brain health of active and retired professional fighters on Capitol Hill in Washington, DC on Tuesday, April 26, 2016. The study, led by researchers from the Cleveland Clinic, is designed to better identify, prevent and treat Chronic Traumatic Encephalopathy (CTE.) Credit: Ron Sachs / CNP ........- NO WIRE SERVICE - Photo: Ron Sachs/Consolidated/dpa. - Washington/District of Columbia/US

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