title: Helmets work best.
authors.forename: P L
authors.initials: PL
authors.lastname: Graitcer
mesh_terms: D000063:Accidents, Traffic / Q000517:prevention & control* / Q000706:statistics & numerical data*; D001642:Bicycling / Q000293:injuries* / Q000331:legislation & jurisprudence; D003299:Cooperative Behavior; D006260:Head Protective Devices; D006801:Humans; D014481:United States