@article{ref1,
title="The risk of motor vehicle accidents involving drivers with prescriptions for codeine or tramadol",
journal="Clinical pharmacology and therapeutics",
year="2009",
author="Bachs, L. C. and Engeland, Anders and Mørland, J. G. and Skurtveit, S.",
volume="85",
number="6",
pages="596-599",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0009-9236",
doi="10.1038/clpt.2009.14",
url="http://dx.doi.org/10.1038/clpt.2009.14"
}