@article{ref1,
title="Risk of suicide in twins: 51 year follow up study",
journal="BMJ",
year="2003",
author="Tomassini, Cecilia and Juel, Knud and Holm, Niels V. and Skytthe, Axel and Christensen, Kaare",
volume="327",
number="7411",
pages="373-374",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0959-535X",
doi="10.1136/bmj.327.7411.373",
url="http://dx.doi.org/10.1136/bmj.327.7411.373"
}