@book{WR-441-HLTH,
author="Paddock, Susan M. and Maria Orlando Edelen and Suzanne L. Wenzel and Patricia A. Ebener and Wallace Mandell",
title="Pattern-Mixture Models for Addressing Nonignorable Nonresponse in Longitudinal Substance Abuse Treatment Studies",
address="Santa Monica, CA",
year="2007",
doi="",
publisher="RAND Corporation"
}