[1] Red Cross War Mem Childrens Hosp, Paediat Intens Care Unit, Cape Town, South Africa
[2] Univ Cape Town, Div Paediat Crit Care & Childrens Heart Dis, Sch Child & Adolescent Hlth, ZA-7925 Cape Town, South Africa
[3] Univ Cape Town, Fac Hlth Sci, Educ Dev Unit, ZA-7925 Cape Town, South Africa
[4] Univ Cape Town, Inst Infect Dis & Mol Med, ZA-7925 Cape Town, South Africa
[5] Univ Cape Town, Fac Hlth Sci, Bioeth Ctr, ZA-7925 Cape Town, South Africa