@article{ref1,
title="A Bump on the Head",
journal="British medical journal: BMJ",
year="1998",
author="Shirley, Peter J.",
volume="317",
number="7163",
pages="955-956",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0959-8138",
doi="",
url="http://dx.doi.org/"
}