@article{ref1,
title="Injuries sustained by users and non-users of gum shields in local rugby union",
journal="British journal of sports medicine",
year="1990",
author="Jennings, D. C.",
volume="24",
number="3",
pages="159-165",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0306-3674",
doi="",
url="http://dx.doi.org/"
}