1. Department of Community Health and Prevention, Drexel University Dornsife School of Public Health, Philadelphia, PA, USA
2. Department of Health Behavior, University of North Carolina at Chapel Hill Gillings School of Global Public Health, Chapel Hill, NC, USA
3. Department of Obstetrics and Gynaecology, University of KwaZulu-Natal Nelson R. Mandela School of Medicine, Congella, South Africa