1. Department of Obstetrics and Gynaecology, Faculty of Health Sciences, Walter Sisulu University, Mthatha, South Africa
2. Department of Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
3. Faculty of Medicine, University of Kinshasa, Kinshasa, Democratic Republic of Congo
4. LOMO University of Research, Kinshasa, Democratic Republic of Congo
5. Non-Communicable Disease Research Unit, South African Medical Research Council, Cape Town, South Africa