@article{ref1,
title="Relationships among pain, depression, and sleep alterations in Parkinson's disease",
journal="Advances in Neurology",
year="1987",
author="Goetz, C. G. and Wilson, R. S. and Tanner, C. M. and Garron, D. C.",
volume="45",
number="",
pages="345-347",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0091-3952",
doi="",
url="http://dx.doi.org/"
}