@article{ref1,
title="Sleep, depression and suicide",
journal="Sleep Medicine",
year="2011",
author="Lettau, Ludwig A.",
volume="12",
number="2",
pages="198; author reply 198-9",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="1389-9457",
doi="10.1016/j.sleep.2010.12.002",
url="http://dx.doi.org/10.1016/j.sleep.2010.12.002"
}