@article{ref1,
title="Abstinence and safer sex among adolescents",
journal="JAMA journal of the American Medical Association",
year="1999",
author="Berman, S. M. and Gunn, R. A. and Aral, S. O.",
volume="281",
number="16",
pages="1485; author reply 1487-8",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0098-7484",
doi="",
url="http://dx.doi.org/"
}