@article{ref1,
title="Alteration of circadian rhythm in shift-working ambulance personnel",
journal="Japanese journal of psychiatry and neurology",
year="1991",
author="Motohashi, Y.",
volume="45",
number="1",
pages="147-148",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0912-2036",
doi="",
url="http://dx.doi.org/"
}