@article{ref1,
title="How complete are E-codes in commercial plan claims databases?",
journal="Pharmacoepidemiology and drug safety",
year="2014",
author="Lu, Christine Y. and Stewart, Christine and Ahmed, Ameena T. and Ahmedani, Brian K. and Coleman, Karen and Copeland, Laurel A. and Hunkeler, Enid M. and Lakoma, Matthew D. and Madden, Jeanne M. and Penfold, Robert B. and Rusinak, Donna and Zhang, Fang and Soumerai, Stephen B.",
volume="23",
number="2",
pages="218-220",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="1053-8569",
doi="10.1002/pds.3551",
url="http://dx.doi.org/10.1002/pds.3551"
}