title: Unhelmeted motorcyclists: do they really cost us a dime?
authors: Michael
authors: M
authors: Heller
mesh_terms: D017281:Cost of Illness; D006259:Craniocerebral Trauma / Q000191:economics* / Q000517:prevention & control*; D006260:Head Protective Devices; D006801:Humans; D009049:Motorcycles / Q000331:legislation & jurisprudence*; D011640:Public Policy; D014481:United States