@article{ref1,
title="The epidemiology of fatigue: more questions than answers",
journal="Journal of epidemiology and community health",
year="1992",
author="Lewis, Glyn and Wessely, Simon",
volume="46",
number="2",
pages="92-97",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0143-005X",
doi="",
url="http://dx.doi.org/"
}