[1] Univ Maryland, Dept Psychol, Cole Field House,Suite 2103, College Pk, MD 20740 USA
[2] Swiss Trop & Publ Hlth Inst, Dept Med, Basel, Switzerland
[3] Univ Basel, Basel, Switzerland
[4] Curtin Univ, Curtin enAble Inst, Alcohol Tobacco & Other Drug Res Unit, Fac Hlth Sci, Perth, WA, Australia
[5] South African Med Res Council, Alcohol Tobacco & Other Drug Res Unit, Cape Town, South Africa
[6] Univ Cape Town, Div Addict Psychiat, Dept Psychiat & Mental Hlth, Cape Town, South Africa
[7] Groote Schuur Hosp, Div Neuropsychiat, Dept Psychiat & Mental Hlth, HIV Mental Hlth Res Unit, Cape Town, South Africa