Bicycle helmets: it's time to use them.
Rivara
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FP
Thompson
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DC
Thompson
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RS
D000063:Accidents, Traffic; D001642:Bicycling; D006259:Craniocerebral Trauma / Q000517:prevention & control*; D006260:Head Protective Devices / Q000706:statistics & numerical data; D006801:Humans; D018570:Risk Assessment