@article{ref1,
title="Re: "Point/counterpoint: meta-analysis of observational studies"",
journal="American journal of epidemiology",
year="1995",
author="Longnecker, M. P.",
volume="142",
number="7",
pages="779-782",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-9262",
doi="",
url="http://dx.doi.org/"
}