@article{ref1,
title="Reduced falls in the elderly: Tai chi or placebo or Hawthorne effect?",
journal="Journal of the American Geriatrics Society",
year="2008",
author="Katz, Alan R.",
volume="56",
number="4",
pages="776-777",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0002-8614",
doi="10.1111/j.1532-5415.2008.01651.x",
url="http://dx.doi.org/10.1111/j.1532-5415.2008.01651.x"
}