[1] Univ Cape Town, Dept Psychiat & Mental Hlth, Cape Town, South Africa
[2] Univ Cape Town, Div Neuropsychiat, HIV Mental Hlth Res Unit, Cape Town, South Africa
[3] Duke Univ, Duke Global Hlth Inst, Durham, NC USA
[4] City Hlth, Subst Abuse, Cape Town, South Africa
[5] Univ Calif San Francisco, Sch Nursing, San Francisco, CA 94143 USA
[6] Duke Univ, Dept Psychiat & Behav Sci, Sch Med, Durham, NC 27706 USA