Two-wheeled motorized vehicular fatalities (needless head injuries).
D000063:Accidents, Traffic; D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D006259:Craniocerebral Trauma / Q000401:mortality*; D006801:Humans; D007484:Iowa; D008875:Middle Aged; D011482:Protective Devices; D014186:Transportation