1. Chris Hani Baragwanath Hospital; Department of Paediatric Cardiology; PO Bertsham Johannesburg South Africa 2013
2. London School of Hygiene & Tropical Medicine; Department of Non-communicable Disease Epidemiology; Keppel Street London UK WC1E 7HT
3. University of the Witwatersrand; Department of Paediatrics and Child Health; P.O. Wits Johannesburg Witwatersrand South Africa 2050