@article{ref1,
title="The National Longitudinal Study on Adolescent Health. Preliminary results: great expectations",
journal="JAMA journal of the American Medical Association",
year="1997",
author="Klein, J. D.",
volume="278",
number="10",
pages="864-865",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0098-7484",
doi="",
url="http://dx.doi.org/"
}