@article{ref1,
title="Epidemiology of hip fractures",
journal="Epidemiologic reviews",
year="1997",
author="Cumming, R. G. and Nevitt, M. C. and Cummings, Steven R.",
volume="19",
number="2",
pages="244-257",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0193-936X",
doi="",
url="http://dx.doi.org/"
}