@article{ref1,
title="Doubts over head injury studies",
journal="BMJ",
year="2007",
author="Roberts, Ian and Smith, Richard and Evans, Stephen",
volume="334",
number="7590",
pages="392-394",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0959-535X",
doi="10.1136/bmj.39118.480023.BE",
url="http://dx.doi.org/10.1136/bmj.39118.480023.BE"
}