@article{ref1,
title="Cabbages and condoms",
journal="International journal of epidemiology",
year="2009",
author="Ebrahim, Shah",
volume="38",
number="2",
pages="327-329",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0300-5771",
doi="10.1093/ije/dyp177",
url="http://dx.doi.org/10.1093/ije/dyp177"
}