Impact of repeal of motorcycle helmet law.
D000063:Accidents, Traffic; D006259:Craniocerebral Trauma / Q000453:epidemiology* / Q000401:mortality; D006260:Head Protective Devices; D006801:Humans; D007615:Kansas; D007878:Legislation as Topic; D011482:Protective Devices; D014947:Wounds and Injuries / Q000453:epidemiology* / Q000401:mortality