@article{ref1,
title="Use of panel study methods",
journal="Journal of trauma",
year="1999",
author="Hoyt, David B.",
volume="47",
number="3 Suppl",
pages="S42-3",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0022-5282",
doi="",
url="http://dx.doi.org/"
}