@article{ref1,
title="Depressive phenomenology and levels of cerebrospinal fluid endorphins",
journal="Annals of the New York Academy of Sciences",
year="1982",
author="Agren, H. and Terenius, L. and Wahlström, A.",
volume="398",
number="",
pages="388-398",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0077-8923",
doi="",
url="http://dx.doi.org/"
}