@article{ref1,
title="Is ankle strength as important as vitamin D status in helping to prevent falls in winter?",
journal="Age and ageing",
year="2013",
author="Macdonald, Helen M.",
volume="42",
number="2",
pages="154-155",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0002-0729",
doi="10.1093/ageing/afs190",
url="http://dx.doi.org/10.1093/ageing/afs190"
}