@article{ref1,
title="The National football League and concussion: leading a culture change in contact sports",
journal="World neurosurgery",
year="2010",
author="Berger, Mitchel S. and Ellenbogen, Richard G. and Batjer, H. Hunt",
volume="74",
number="6",
pages="560-565",
abstract="<p>[Abstract unavailable]  Keywords: American football </p> <p>Language: en</p>",
language="en",
issn="1878-8750",
doi="10.1016/j.wneu.2010.11.016",
url="http://dx.doi.org/10.1016/j.wneu.2010.11.016"
}