00339nas a2200133   4500000000100000008004100001100001500042700001500057700001400072700001300086245008800099300001100187490000700198       2000                            d1 aJackson R.1 aLangley J.1 aMullin B.1 aNorton R00aMotorcycle engine size and risk of moderate to fatal injury from a motorcycle crash  a659-630 v32