1. Institute for Global Health Sciences, University of California San Francisco, San Francisco, USA
2. Department of Obstetrics and Gynaecology, Makerere University College of Health Sciences, Kampala, Uganda
3. Department of Obstetrics, Gynecology and Reproductive Sciences, University of California San Francisco, San Francisco, USA
4. Global Health Program, NYU School of Global Public Health, New York, NY, USA
5. Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, USA