@article{ref1,
title="Comorbidity in bipolar disorder: clinical and research opportunities",
journal="Bipolar disorders",
year="2006",
author="McIntyre, Roger S. and Keck, P. E. Jr",
volume="8",
number="6",
pages="645-647",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="1398-5647",
doi="10.1111/j.1399-5618.2006.00409.x",
url="http://dx.doi.org/10.1111/j.1399-5618.2006.00409.x"
}