[1] Univ Witwatersrand, Fac Hlth Sci, Sch Anat Sci, Johannesburg, South Africa
[2] Greys Hosp, Dept Anaesthesia, Pietermaritzburg, South Africa
[3] Stellenbosch Univ, Dept Anaesthesiol & Crit Care, Fac Med & Hlth Sci, Stellenbosch, South Africa
[4] Univ Cape Town, Fac Hlth Sci, Dept Psychiat & Mental Hlth, Rondebosch, South Africa
[5] South African Med Res Council, Cape Town, South Africa
[6] Univ Pretoria, Dept Psychiat, Fac Hlth Sci, Pretoria, South Africa
[7] Frere Hosp, East London, South Africa
[8] Univ Witwatersrand, Brain Funct Res Grp, Fac Hlth Sci, Johannesburg, South Africa
[9] Curtin Univ, Sch Biomed Sci, Perth, WA, Australia
[10] Univ Stellenbosch, Dept Biomed Sci, Fac Med & Hlth Sci, Stellenbosch, South Africa
[11] Univ Free State, Dept Pharmacol, Fac Hlth Sci, Bloemfontein, South Africa
[12] Univ Western Cape, Sch Pharm, Fac Nat Sci, Cape Town, South Africa
[13] South African Med Res Council, Grants Innovat & Product Dev, Strateg Hlth Innovat Partnerships, Cape Town, South Africa
[14] South African Med Res Council, Alcohol & Tobacco & Other Drug Res Unit, Cape Town, South Africa
[15] Stellenbosch Univ, Dept Psychiat, Fac Med & Hlth Sci, Stellenbosch, South Africa
[16] Sefako Makgatho Hlth Sci Univ, Sch Med, Dept Psychiat, Ga Rankuwa, South Africa
[17] Univ Cape Town, Fac Hlth Sci, Dept Psychiat & Mental Hlth, Cape Town, South Africa
[18] Univ Pretoria, Dept Pharmacol, Fac Hlth Sci, Pretoria, South Africa
[19] Stellenbosch Univ, Dept Psychiat, Fac Med & Hlth Sci, Stellenbosch, South Africa
[20] Univ Cape Town, Lung Inst, Fac Hlth Sci, Cape Town, South Africa
[21] Univ Cape Town, Div Pulmonol, Fac Hlth Sci, Cape Town, South Africa