Venting spleen: helmet legislation.
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D000056:Accident Prevention; D001315:Australia; D001642:Bicycling / Q000293:injuries* / Q000331:legislation & jurisprudence*; D002648:Child; D002675:Child, Preschool; D003718:Denmark; D005260:Female; D006260:Head Protective Devices; D006801:Humans; D007391:International Cooperation; D008297:Male; D009426:Netherlands; D006113:United Kingdom