@article{ref1,
title="Heading football is related to concussion symptoms, study finds",
journal="BMJ",
year="2017",
author="Wise, Jacqui",
volume="356",
number="",
pages="j569-j569",
abstract="<p>[Abstract unavailable]  Keywords: Soccer</p> <p>Language: en</p>",
language="en",
issn="0959-535X",
doi="",
url="http://dx.doi.org/"
}