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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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    Most ex-players in concussion study had a brain disease

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Most ex-players in concussion study had a brain disease

Alarming concussion report shows 87 of 91 ex-NFL players in study suffered a brain disease. CNN Chief medical correspondent Sanjay Gupta explains.

Most ex-players in concussion study had a brain disease

Alarming concussion report shows 87 of 91 ex-NFL players in study suffered a brain disease. CNN Chief medical correspondent Sanjay Gupta explains.