Ottawa Senators defenseman Erik Karlsson (65) limps off the ice as a team trainer arrives to help him after Karlsson collided with Pittsburgh Penguins left wing Matt Cooke during the second period of an NHL hockey game in Pittsburgh on Wednesday, Feb. 13, 2013. Karlsson did not return to the game. The Penguins won 4-2. (AP Photo/Gene J. Puskar)
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