@article{ref1,
title="Epidemiological issues in weak associations",
journal="International journal of epidemiology",
year="1990",
author="Wynder, E. L.",
volume="19",
number="Suppl 1",
pages="S5-7",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0300-5771",
doi="",
url="http://dx.doi.org/"
}