@article{ref1,
title="Analyzing the balance of risk",
journal="Addiction",
year="1995",
author="Duffy, J. C.",
volume="90",
number="4",
pages="484-5; discussion 493",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0965-2140",
doi="",
url="http://dx.doi.org/"
}