@article{ref1,
title="Response to L.A. Lettau's "Sleep, Depression and Suicide"",
journal="Sleep Medicine",
year="2013",
author="Pigeon, Wilfred R. and Caine, Eric D.",
volume="ePub",
number="ePub",
pages="ePub-ePub",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="1389-9457",
doi="10.1016/j.sleep.2010.12.001",
url="http://dx.doi.org/10.1016/j.sleep.2010.12.001"
}