@article{ref1,
title="Contact sports for young athletes: keys to safety",
journal="Pediatric annals",
year="2010",
author="Halstead, Mark E.",
volume="39",
number="5",
pages="275-278",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0090-4481",
doi="10.3928/00904481-20100422-07",
url="http://dx.doi.org/10.3928/00904481-20100422-07"
}