Increased mortality following repeal of mandatory motorcycle helmet law.
D000063:Accidents, Traffic / Q000517:prevention & control*; D000293:Adolescent; D006259:Craniocerebral Trauma / Q000209:etiology / Q000401:mortality*; D006260:Head Protective Devices; D006801:Humans; D007196:Indiana; D007883:Legislation, Medical; D011482:Protective Devices