@article{ref1,
title="Brain injury and heading in soccer",
journal="BMJ",
year="2003",
author="McCrory, Paul R.",
volume="327",
number="7411",
pages="351-352",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0959-535X",
doi="10.1136/bmj.327.7411.351",
url="http://dx.doi.org/10.1136/bmj.327.7411.351"
}