title: The use of bicycle helmets should not be mandatory.
authors.forename: T J
authors.initials: TJ
authors.lastname: De Marco
mesh_terms: D001315:Australia; D001642:Bicycling / Q000293:injuries* / Q000331:legislation & jurisprudence; D002170:Canada; D006259:Craniocerebral Trauma / Q000453:epidemiology / Q000209:etiology / Q000517:prevention & control*; D006260:Head Protective Devices; D006801:Humans; D012307:Risk Factors; D006113:United Kingdom