Aaron Burmeister is seen at the Nikolai checkpoint, after having his knee pop out and having to tape it up so it would stay in place during the 2014 Iditarod Trail Sled Dog Race on Tuesday, March 4, 2014, in Nikolai, Alaska. Burmeister injured his knee about 18 miles past the Rohn checkpoint on the snowless Farewell Burn. (AP Photo/The Anchorage Daily News, Bob Hallinen)
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