@article{ref1,
title="Conducting truck drivers' physical exams. the high prevalence of sleep apnea",
journal="Minnesota medicine",
year="1997",
author="Asp, D. S.",
volume="80",
number="1",
pages="29-30",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0026-556X",
doi="",
url="http://dx.doi.org/"
}