1. Cardiology Unit, Department of Paediatrics, Faculty of Clinical Sciences, University of Abuja, Abuja, Nigeria;
2. Division of Paediatric Cardiology, Department of Paediatrics, Chris Hani Baragwanath Academic Hospital, and
3. Department of Paediatrics and Child Health, University of the Witwatersrand, Johannesburg, South Africa;
4. Division of Pediatric Emergency Medicine, Department of Pediatrics, Emory University School of Medicine, Atlanta, Georgia;
5. Children’s Healthcare of Atlanta, Atlanta, Georgia; and
6. Center for Clinical and Translational Research of Children’s Healthcare of Atlanta and Emory University, Atlanta, Georgia