Attorneys suing the NCAA over its handling of head injuries asked a federal judge Friday to let them expand the lawsuit nationwide to include thousands of plaintiffs in a case they contend could change college sports forever.

A report for the players by Robert Cantu, a leading authority on concussions, cites an internal NCAA survey from 2010. Cantu said the NCAA found that nearly half of the college trainers who responded to the survey indicated they put athletes showing signs of a concussion back into the same game.

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