Cyclists' helmets.
Kennedy
A
A
D000063:Accidents, Traffic / Q000517:prevention & control*; D001642:Bicycling / Q000293:injuries* / Q000331:legislation & jurisprudence; D006259:Craniocerebral Trauma / Q000401:mortality / Q000517:prevention & control*; D006260:Head Protective Devices / Q000706:statistics & numerical data; D006801:Humans; D006113:United Kingdom / Q000453:epidemiology