@article{ref1,
title="Concussion in professional football: reconstruction of game impacts and injuries",
journal="Neurosurgery",
year="2004",
author="Gordon, A. G.",
volume="55",
number="1",
pages="260-3; author reply 263",
abstract="<p>[Abstract unavailable]  Keywords: American football </p> <p>Language: en</p>",
language="en",
issn="0148-396X",
doi="",
url="http://dx.doi.org/"
}