@article{ref1,
title="Concussion management at the NFL, college, high school, and youth sports levels",
journal="Clinical neurosurgery",
year="2011",
author="Maroon, Joseph C. and Bost, Jeffrey W.",
volume="58",
number="",
pages="51-56",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0069-4827",
doi="",
url="http://dx.doi.org/"
}