@article{ref1,
title="Testing interventions to preserve walking ability: progress against disability, one step at a time",
journal="Journals of gerontology. Series A: Biological sciences and medical sciences",
year="2007",
author="Hadley, E. C.",
volume="62",
number="8",
pages="834-836",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="1079-5006",
doi="",
url="http://dx.doi.org/"
}