1. Division of Epidemiology & Biostatistics, School of Public Health & Family Medicine, University of Cape Town, Cape Town, South Africa
2. Division of Epidemiology & Biostatistics, School of Public Health & Family Medicine, University of Cape Town, Cape Town, South Africa, Institute for Global Health, University College London, London, UK, Centre for Infectious Diseases
Research-AFRICA, University of Cape Town, Cape Town, South Africa
3. ICAP-Columbia University, New York, New York, USA
4. Department of Obstetrics & Gynaecology, University of Cape Town and New Somerset Hospital, Cape Town
5. Division of Epidemiology & Biostatistics, School of Public Health & Family Medicine, University of Cape Town, Cape Town, South Africa, Anova Health Institute, Johannesburg, South Africa
6. ICAP-Columbia University, New York, New York, USA, College of Physicians & Surgeons, Columbia University, New York, New York, USA