@article{ref1,
title="Calcium-PTH-vitamin D axis in older patients with hip fracture",
journal="Osteoporosis international",
year="2007",
author="Fisher, A. A. and Davis, M. W.",
volume="18",
number="5",
pages="693-5; author reply 697",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0937-941X",
doi="10.1007/s00198-006-0284-x",
url="http://dx.doi.org/10.1007/s00198-006-0284-x"
}