@article{ref1,
title="Differential peeky bias",
journal="International journal of occupational and environmental health",
year="2006",
author="Egilman, David S. and Billings, Marion A.",
volume="12",
number="3",
pages="294-294",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="1077-3525",
doi="",
url="http://dx.doi.org/"
}