Heading off tragedy.
D000293:Adolescent; D001642:Bicycling / Q000293:injuries* / Q000331:legislation & jurisprudence; D001930:Brain Injuries / Q000453:epidemiology / Q000517:prevention & control*; D017809:Fatal Outcome; D006260:Head Protective Devices; D006801:Humans; D008297:Male; D012449:Safety / Q000331:legislation & jurisprudence*; D006113:United Kingdom / Q000453:epidemiology