1. Maternal and Reproductive Health Research Unit, Division of Clinical Sciences, Nigerian Institute of Medical Research, 101212 Yaba Lagos, Nigeria
2. Division of Global and International Health, Faculty of Medicine, Lund University, 20502 Malmo, Sweden
3. Department of Obstetrics and Gynecology, School of Medicine, Makerere University, College of Health Sciences, P.O. Box 7072, Kampala, Uganda