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nfl brain study concussion cte brain disease gupta sot nr_00014630
nfl brain study concussion cte brain disease gupta sot nr_00014630

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    Researchers: 96% of ex-NFL players had brain disease

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Researchers: 96% of ex-NFL players had brain disease

Researchers say 96% of former NFL players who donated their brains to science after death tested positive for a brain disease linked to concussions. CNN's Sanjay Gupta explains.

Researchers: 96% of ex-NFL players had brain disease

Researchers say 96% of former NFL players who donated their brains to science after death tested positive for a brain disease linked to concussions. CNN's Sanjay Gupta explains.