@article{ref1,
title="Suicide: a silent contributor to opioid-overdose deaths",
journal="New England journal of medicine",
year="2018",
author="Oquendo, Maria A. and Volkow, Nora D.",
volume="378",
number="17",
pages="1567-1569",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0028-4793",
doi="10.1056/NEJMp1801417",
url="http://dx.doi.org/10.1056/NEJMp1801417"
}