Butting heads over bicycle helmets.
Wardlaw
Malcolm
M
D001642:Bicycling / Q000293:injuries* / Q000331:legislation & jurisprudence*; D002170:Canada / Q000453:epidemiology; D006259:Craniocerebral Trauma / Q000453:epidemiology* / Q000209:etiology*; D005060:Europe / Q000453:epidemiology; D006260:Head Protective Devices / Q000706:statistics & numerical data*; D006801:Humans; D009674:Nova Scotia / Q000453:epidemiology; D011159:Population Surveillance; D012307:Risk Factors; D017751:Safety Management / Q000331:legislation & jurisprudence* / Q000379:methods*; D014481:United States / Q000453:epidemiology