@article{ref1,
title="Injury prevention. Bicycle helmet promotion programmes, Canada, Australia, and United States of America",
journal="Weekly epidemiological record",
year="1993",
author="",
volume="68",
number="20",
pages="146-147",
abstract="Abstract unavailable.",
language="",
issn="0049-8114",
doi="",
url="http://dx.doi.org/"
}