Cycle injury trends: helmets are most likely explanation.
Cook
A
A
Sheikh
A
A
D001642:Bicycling / Q000293:injuries*; D006259:Craniocerebral Trauma / Q000401:mortality*; D006260:Head Protective Devices; D006801:Humans; D015995:Prevalence; D006113:United Kingdom / Q000453:epidemiology