@article{ref1,
title="Background on the National Football League's research on concussion in professional football",
journal="Neurosurgery",
year="2003",
author="Pellman, Elliot J.",
volume="53",
number="4",
pages="797-798",
abstract="<p>[Abstract unavailable]  Keywords: American football </p> <p>Language: en</p>",
language="en",
issn="0148-396X",
doi="",
url="http://dx.doi.org/"
}