@article{ref1,
title="Data attrition in follow-up studies of alcoholics",
journal="Journal of studies on alcohol",
year="1976",
author="Vannicelli, M. and Pfau, B. and Ryback, R. S.",
volume="37",
number="9",
pages="1325-1330",
abstract="Alcoholics who responded to posttreatment follow-up evaluation showed more improvement than those wh did not respond. Thus nonresponders may bias follow-up research tht does not account for missing data. Several procedures are outlined to increase follow-up return.<p /><p>Language: en</p>",
language="en",
issn="0096-882X",
doi="",
url="http://dx.doi.org/"
}