title: Widespread variations exist in bike helmet laws across Canada.
authors: Quentin
authors: Q
authors: Casey
mesh_terms: D001642:Bicycling / Q000293:injuries* / Q000331:legislation & jurisprudence*; D002170:Canada; D006259:Craniocerebral Trauma / Q000517:prevention & control*; D006260:Head Protective Devices / Q000706:statistics & numerical data*; D006801:Humans