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2. Berrington L, Darch M. The Times 10 July 1995.
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4. A case control study of the effectiveness ofbicycle safety helmets;Thompson, R.S.; Rivara, F.P.; Thompson, D.C.;N EnglJt Med,1989
5. Wheels-in-line roller skating injuries;Calle, C.; Eaton, R.G.;J Trauma,1993