@article{ref1,
title="Cannabis and psychosis: two kinds of limitations which attach to epidemiological research",
journal="Addiction",
year="2004",
author="Fergusson, David M.",
volume="99",
number="4",
pages="512-3; author reply 515",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0965-2140",
doi="10.1111/j.1360-0443.2004.00699.x",
url="http://dx.doi.org/10.1111/j.1360-0443.2004.00699.x"
}