@article{ref1,
title="Headache after sports-related concussion",
journal="Headache",
year="2013",
author="Tepper, Deborah",
volume="53",
number="7",
pages="1197-1198",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0017-8748",
doi="10.1111/head.12146",
url="http://dx.doi.org/10.1111/head.12146"
}