[1] Univ Calif Los Angeles, Integrated Subst Abuse Programs, Los Angeles, CA 90024 USA
[2] RAND Corp, Santa Monica, CA 90407 USA
[3] Wayne State Univ, Sch Med, Subst Abuse Res Div, Dept Psychiat & Behav Neurosci, Detroit, MI 48202 USA
[4] Eastern Michigan Univ, Dept Psychol, Ypsilanti, MI 48197 USA