Butting heads over bicycle helmets.
Thomas J
TJ
DeMarco
D000063:Accidents, Traffic / Q000331:legislation & jurisprudence / Q000401:mortality / Q000517:prevention & control* / Q000706:statistics & numerical data; D001642:Bicycling / Q000293:injuries* / Q000331:legislation & jurisprudence*; D002170:Canada / Q000453:epidemiology; D006260:Head Protective Devices / Q000706:statistics & numerical data*; D006801:Humans; D017751:Safety Management / Q000331:legislation & jurisprudence* / Q000379:methods*