Motorcycle deaths and injuries in Texas: helmets make a difference.
D000063:Accidents, Traffic; D006259:Craniocerebral Trauma / Q000453:epidemiology / Q000401:mortality*; D006260:Head Protective Devices; D006801:Humans; D007878:Legislation as Topic; D009049:Motorcycles; D011482:Protective Devices; D013781:Texas