@article{ref1,
title="Differences in mortality after fracture of hip. Casemix factors may not have been considered sufficiently",
journal="British medical journal: BMJ",
year="1995",
author="Packham, C. J.",
volume="311",
number="7004",
pages="571-2; author reply 572",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0959-8138",
doi="",
url="http://dx.doi.org/"
}