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The Washington Post has featured one of the plaintiffs in an ongoing legal battle over concussions and their lingering effects against the National Collegiate Athletic Association.

Les Williams played football for University of Alabama in the early 2000s. He recalled many of the hits he took during his college career, which he believes have led to constant headaches and mood changes, the Post reported.

These symptoms are consistent with those displayed by men and women who have taken blows to the head and developed a brain disease known as chronic traumatic encephalopathy, or CTE.

Researchers have found that a majority of professional football and college players whose brains they have examined developed CTE, which can only be definitively diagnosed after death.