@article{ref1,
title="Opioids and fatal drug poisoning",
journal="Journal of pain and palliative care pharmacotherapy",
year="2008",
author="Davis, M.",
volume="22",
number="1",
pages="30-31",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="1536-0288",
doi="",
url="http://dx.doi.org/"
}