1. Department of Obstetrics and Gynaecology, Subdepartment of Fetal Medicine, University of Kwa-Zulu Natal, Durban, South Africa;
2. Department of Cardiology, University of Kwa-Zulu Natal, Durban, South Africa;
3. Department of Obstetrics and Gynaecology and Women’s Health and HIV Research Group, University of Kwa-Zulu Natal, Durban, South Africa