Bicycle helmets: effective protection.

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@article{Parkin1992BicycleHE, title={Bicycle helmets: effective protection.}, author={Patricia C. Parkin and Xin-ai Hu and Laura J. Spence and David E. Wesson}, journal={CMAJ : Canadian Medical Association journal = journal de l'Association medicale canadienne}, year={1992}, volume={147 11}, pages={1631} }