@article{ref1,
title="Bicycle helmet ownership and use in the United States",
journal="Injury control and safety promotion",
year="2000",
author="Rodgers, Gregory B.",
volume="7",
number="2",
pages="135-138",
abstract="Abstract unavailable.<p />",
language="",
issn="1566-0974",
doi="",
url="http://dx.doi.org/"
}