Brain damage found in 99 percent of deceased NFL players' brains

New research has confirmed the devastating effect on the brain for many who play America's number-one sport.

    New research has confirmed the devastating effect on the brain for many who play America's number-one sport.

    Post-mortem examinations of more than 200 former NFL players found that nearly 99 percent revealed signs of a disease linked with repeated blows to the head.

    Al Jazeera's Mike Hanna reports from New York.


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