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A study on head trauma in junior hockey, the first at any level to rely on independent medically trained observers, found that the incidence of game-related concussions was seven times the rate found in a 2005 study of N.C.A.A. Division I players. [excerpt from article linked below]
http://www.nytimes.com/2010/11/02/sports/hockey/02concussions.html?ref=sports
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