@article{ref1,
title="Principles to help prevent youth sports-related injuries",
journal="American family physician",
year="2007",
author="Stephens, Mark B. and Beutler, A.",
volume="75",
number="11",
pages="1620-1620",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0002-838X",
doi="",
url="http://dx.doi.org/"
}