@article{ref1,
title="Increasing bicycle helmet effectiveness: the importance of proper helmet fit and wearing position",
journal="HMO practice",
year="1997",
author="Rivara, Frederick P. and Kaufman, A. and Thompson, R. S. and Thompson, D. C.",
volume="11",
number="1",
pages="25-26",
abstract="Abstract unavailable.",
language="",
issn="0891-6624",
doi="",
url="http://dx.doi.org/"
}