@article{ref1,
title="Associations Between Prescription Opioid Use and Sleep Impairment among Veterans with Chronic Pain: Association between Opioids and Sleep Impairment",
journal="Pain medicine",
year="2014",
author="Morasco, Benjamin J. and O'Hearn, Daniel and Turk, Dennis C. and Dobscha, Steven K.",
volume="15",
number="11",
pages="1902-1910",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="1526-2375",
doi="10.1111/pme.12472",
url="http://dx.doi.org/10.1111/pme.12472"
}