@article{ref1,
title="Concussions in high school sports: are they worth the risk? Should school football be banned?",
journal="Missouri medicine",
year="2012",
author="Mahaffey, Bran L.",
volume="109",
number="6",
pages="445-449",
abstract="<p>[Abstract unavailable]  Keywords: American football; </p> <p>Language: en</p>",
language="en",
issn="0026-6620",
doi="",
url="http://dx.doi.org/"
}