@article{ref1,
title="Teenagers, sex, and risk taking",
journal="British medical journal: BMJ",
year="1993",
author="Kaul, R. and Kaul, S.",
volume="307",
number="6905",
pages="683-683",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0959-8138",
doi="",
url="http://dx.doi.org/"
}