@article{ref1,
title="Non‐response in alcohol and drug surveys: a research topic in need of further attention",
journal="Addiction",
year="2001",
author="Caetano, Raul",
volume="96",
number="11",
pages="1541-1545",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0965-2140",
doi="10.1046/j.1360-0443.2001.961115411.x",
url="http://dx.doi.org/10.1046/j.1360-0443.2001.961115411.x"
}