[1] Swiss Inst Prevent Alcohol & Drug Problems, Res Dept, CH-1001 Lausanne, Switzerland
[2] Univ Bern, Dept Psychol, CH-3012 Bern, Switzerland
[3] Univ Lausanne Hosp, Alcohol Treatment Ctr, Lausanne, Switzerland
[4] Ctr Addict & Mental Hlth, Toronto, ON, Canada