@article{ref1,
title="Iii. Substance‐use patterns and correlations among variables",
journal="Monographs of the society for research in child development",
year="2009",
author="",
volume="74",
number="3",
pages="38-50",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0037-976X",
doi="10.1111/j.1540-5834.2009.00531.x",
url="http://dx.doi.org/10.1111/j.1540-5834.2009.00531.x"
}