@article{ref1,
title="Results from the National Adolescent Student Health Survey",
journal="MMWR: Morbidity and mortality weekly report",
year="1989",
author="Centers for Disease Control and Prevention, USA, ",
volume="38",
number="9",
pages="147-150",
abstract="Abstract unavailable.",
language="en",
issn="0149-2195",
doi="",
url="http://dx.doi.org/"
}