1. Department of Paediatrics & Child Health, Faculty of Medicine & Health Sciences, Stellenbosch University , Worcester, Western Cape 6850, South Africa
2. Western Cape Government Department of Health, Worcester Provincial Hospital , Worcester, Western Cape 6850, South Africa
3. Department of Global Health, Faculty of Medicine & Health Sciences, Ukwanda Centre for Rural Health, Stellenbosch University , Worcester, Western Cape 6850, South Africa