[1] Univ Cape Town, Dept Psychiat & Mental Hlth, Alan J Flisher Ctr Publ Mental Hlth, Cape Town, South Africa
[2] South African Med Res Council, Alcohol Tobacco & Other Drug Res Unit, Cape Town, South Africa
[3] Univ Cape Town, Dept Psychiat & Mental Hlth, Cape Town, South Africa
[4] Western Cape Dept Hlth, Cape Town, South Africa
[5] Univ Cape Town, Sch Publ Hlth Med & Family Med, Cape Town, South Africa
[6] Univ Cape Town, Dept Psychiat, SA MRC Unit Risk Resilience Mental Disorders, Cape Town, South Africa
[7] Univ Cape Town, Neurosci Inst, SA MRC Unit Risk Resilience Mental Disorders, Cape Town, South Africa
[8] Univ Stellenbosch, Dept Emergency Med, Stellenbosch, South Africa
[9] Khayelitsha Hosp, Emergency Serv, Cape Town, South Africa