The effectiveness of a special ice hockey helmet to reduce head injuries in college intramural hockey.
D006259:Craniocerebral Trauma / Q000453:epidemiology / Q000209:etiology / Q000517:prevention & control*; D005069:Evaluation Studies as Topic; D006801:Humans; D008910:Minnesota; D011481:Protective Clothing; D013178:Sports Medicine; D014495:Universities