1. Division of Maternal–Fetal Medicine, Oregon Health and Science University, Portland, USA
2. Global Network for Perinatal and Reproductive Health, Portland, USA
3. Department of Obstetrics and Gynaecology, Harare Central Hospital, University of Zimbabwe, Harare, Zimbabwe
4. Department of Biostatistics, University of North Carolina, Chapel Hill, USA
5. Department of Pediatrics, Harare Central Hospital, University of Zimbabwe, Harare, Zimbabwe
6. International Center for Advancing Neonatal Health, Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, USA
7. Department of Medical Laboratory Sciences, University of Zimbabwe, Harare, Zimbabwe
8. Department of Obstetrics and Gynecology, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand