@article{ref1,
title="Varenicline for tobacco dependence",
journal="New England journal of medicine",
year="2009",
author="Tavares, Almir R. Jr",
volume="360",
number="7",
pages="731-731",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0028-4793",
doi="",
url="http://dx.doi.org/"
}