@article{ref1,
title="Athletic concussion: current understanding as of 2007",
journal="Neurosurgery",
year="2007",
author="Ropper, Allan H.",
volume="61",
number="6",
pages="E1340; author reply E1340-E1340; author reply E1340",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0148-396X",
doi="10.1227/01.neu.0000306138.51602.75",
url="http://dx.doi.org/10.1227/01.neu.0000306138.51602.75"
}