Bodychecking in hockey.
Ross
Ian B
IB
D000293:Adolescent; D001924:Brain Concussion / Q000453:epidemiology* / Q000517:prevention & control; D002170:Canada / Q000453:epidemiology; D002648:Child; D002675:Child, Preschool; D012090:Cumulative Trauma Disorders / Q000453:epidemiology / Q000517:prevention & control; D006688:Hockey / Q000293:injuries*; D006801:Humans; D012307:Risk Factors