title: Keeping our helmet laws--who is the best teacher?
authors.forename: Alan
authors.initials: A
authors.lastname: Clark
mesh_terms: D000328:Adult; D006259:Craniocerebral Trauma / Q000517:prevention & control*; D006260:Head Protective Devices; D006801:Humans; D008923:Missouri; D009049:Motorcycles / Q000331:legislation & jurisprudence*