Aga Khan University, London School of Hygiene & Tropical Medicine, Aga Khan University, London School of Hygiene & Tropical Medicine - Medical Research Council Unit: The Gambia, London School of Hygiene & Tropical Medicine - Medical Research Council Unit: The Gambia, London School of Hygiene & Tropical Medicine - Medical Research Council Unit The Gambia, Centro de Investigação em Saúde da Manhiça (CISM), Centro de Investigação em Saúde da Manhiça (CISM), Centro de Investigação em Saúde da Manhiça (CISM), London School of Hygiene and Tropical Medicine, University College London - University College London Hospitals NHS Foundation Trust, Aga Khan University, Aga Khan University, King’s College London, King’s College London - Department of Women and Children’s Health, University of Oxford - Nuffield Department of Women's and Reproductive Health, Aga Khan University - Centre of Excellence in Women and Child Health, King’s College London - Department of Women and Children’s Health, London School of Hygiene & Tropical Medicine and Unaffiliated Author