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NHL has unique off-ice concussion foe

Updated: December 9, 2010, 4:01 PM ET
By Pierre LeBrun | ESPN.com

You might be surprised to learn what one doctor says has been one of the most interesting hurdles in his research in dealing with head injuries.

A player's passport.

Football and hockey face a serious battle when it comes to head injuries, but the NHL has an added wrinkle the NFL doesn't have to worry about: the communication barrier. Take a league that had 879 players from 25 countries in 2009-10, and communicating what ails you or understanding what a doctor ...

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