Helmets for motor-cyclists: are there any medical grounds for exemption?
Trinca
G
G
Simpson
D A
DA
D001315:Australia; D006259:Craniocerebral Trauma / Q000517:prevention & control*; D006260:Head Protective Devices / Q000592:standards*; D006801:Humans; D009049:Motorcycles; D011482:Protective Devices / Q000592:standards*