aDepartment of Pediatrics & Child Health, Red Cross War Memorial Children's Hospital, and SA MRC Unit on Child & Adolescent Health, University of Cape Town, Cape Town, South Africa;

bDepartment of Paediatrics and Child Health, Tygerberg Hospital, Stellenbosch University, Cape Town, South Africa;

cDivision of Cardiology, Department of Medicine, Groote Schuur Hospital and Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa;

dDivision of Epidemiology & Biostatistics, School of Public Health & Family Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa; and

eDivision of Infectious Diseases, Department of Pediatrics, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL.

Correspondence to: Sana Mahtab, MBBS, MPH, PhD, REACH B-11, Department of Paediatrics, Red Cross War Memorial Children's Hospital, University of Cape Town, Cape Town 7700, South Africa (e-mail: [email protected]).

Supported by the Eunice Kennedy Shriver National Institute of Child Health and Human Development (R01HD074051) and the South African Medical Research Council (SAMRC).

The authors have no funding or conflicts of interest to disclose.

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