This combination of photos provided by Boston University shows sections from a normal brain, top, and from the brain of former University of Texas football player Greg Ploetz, bottom, in stage IV of chronic traumatic encephalopathy. According to a report released on Tuesday, July 25, 2017, by the Journal of the American Medical Association, research on 202 former football players found evidence of a brain disease linked to repeated head blows in nearly all of them, from athletes in the National Football League, college and even high school. (Dr. Ann McKee/BU via AP) ** FILE **
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