@article{ref1,
title="Headache and head injury ... post hoc, or propter hoc?",
journal="Headache",
year="1988",
author="Edmeads, J.",
volume="28",
number="3",
pages="228-229",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0017-8748",
doi="",
url="http://dx.doi.org/"
}