@article{ref1,
title="Crack smiles",
journal="JAMA journal of the American Medical Association",
year="1991",
author="Rothstein, S. G. and Gittelman, P. and Persky, M. S.",
volume="265",
number="12",
pages="1528-1528",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0098-7484",
doi="",
url="http://dx.doi.org/"
}