@article{ref1,
title="Clinical implications of the endogenous opiates: Part I. Physiological",
journal="Psychiatric medicine",
year="1983",
author="Gambert, S. R. and Garthwaite, T. L. and Tate, P. W.",
volume="1",
number="1",
pages="93-105",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0732-0868",
doi="",
url="http://dx.doi.org/"
}