@article{ref1,
title="Widespread variations exist in bike helmet laws across Canada",
journal="CMAJ : Canadian Medical Association journal",
year="2010",
author="Casey, Quentin",
volume="182",
number="13",
pages="E635-6",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0820-3946",
doi="10.1503/cmaj.109-3319",
url="http://dx.doi.org/10.1503/cmaj.109-3319"
}