Helmets for child bicyclists.
Bader
M
M
D001642:Bicycling / Q000293:injuries*; D002648:Child; D003362:Cost-Benefit Analysis; D006259:Craniocerebral Trauma / Q000517:prevention & control*; D006260:Head Protective Devices / Q000191:economics; D006801:Humans; D011482:Protective Devices / Q000191:economics