@article{ref1,
title="Using epidemiologic methods to evaluate out-of-hospital care: the ecologic study",
journal="Annals of emergency medicine",
year="1995",
author="Maio, Ronald F. and Spaite, D.",
volume="26",
number="2",
pages="153-157",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0196-0644",
doi="",
url="http://dx.doi.org/"
}