@article{ref1,
title="Tai chi may prevent falls",
journal="Nurse practitioner",
year="2007",
author="",
volume="32",
number="12",
pages="45-45",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0361-1817",
doi="10.1097/01.NPR.0000300829.97335.a2",
url="http://dx.doi.org/10.1097/01.NPR.0000300829.97335.a2"
}