Affiliation: | (1) Director, Substance Abuse Research Group, Westat, Rockville, MD, USA;(2) National Institute on Drug Abuse, Prevention Research Branch, Division of Epedemiology, Services and Prevention Research, Westat, Rockville, MD, USA;(3) Director, Center for Studies on Alcohol, Westat, Rockville, MD, USA;(4) Westat, 1650 Research Boulevard, Rockville, MD 20850, USA |