@article{ref1,
title="Sleep duration among Black and White Americans. [Letter]",
journal="Journal of the National Medical Association",
year="2008",
author="Bell, Carl C.",
volume="100",
number="5",
pages="577-577",
abstract="][Abstract unavailable]  <p>Language: en</p>",
language="en",
issn="1943-4693",
doi="",
url="http://dx.doi.org/"
}