@article{ref1,
title="Bicycle helmet campaign",
journal="CMAJ : Canadian Medical Association journal",
year="1991",
author="",
volume="145",
number="8",
pages="921-923",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0820-3946",
doi="",
url="http://dx.doi.org/"
}