@article{ref1,
title="Methods used to quit smoking in the United States: Do cessation programs help?",
journal="Journal of safety research",
year="1990",
author="Newcomb, PA and Davis, R. M. and Surawicz, TS and Hatziandreu, E. J. and Giovino, G. A. and Pierce, J. P. and Novotny, TE and Fiore, MC",
volume="21",
number="4",
pages="168-169",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0022-4375",
doi="",
url="http://dx.doi.org/"
}