Liverpool School of Tropical Medicine, Liverpool School of Tropical Medicine, Liverpool School of Tropical Medicine, Muhimbili University of Health and Allied Sciences, North Manchester General Hospital - Regional Infectious Diseases Unit, University of Malawi - Malawi-Liverpool-Wellcome Trust Clinical Research Programme, Duke University - Duke University Hospital, Kilimanjaro Christian Medical University College, Duke University - School of Medicine, Muhimbili University of Health and Allied Sciences, Muhimbili University of Health and Allied Sciences, Muhimbili University of Health and Allied Sciences, Kilimanjaro Christian Medical University College - Kilimanjaro Clinical Research Institute, University of Malawi - School of Public Health and Family Medicine, Kamuzu University of Health Sciences, University of Malawi - Malawi-Liverpool-Wellcome Trust Clinical Research Programme, Liverpool School of Tropical Medicine, Kilimanjaro Christian Medical University College - Kilimanjaro Clinical Research Institute, Kilimanjaro Christian Medical University College, Achikondi Women Community Clinic, Liverpool School of Tropical Medicine - Department of International Public Health, Kilimanjaro Christian Medical University College, Liverpool School of Tropical Medicine - Centre for Maternal and Newborn Health, University of Malawi - Malawi-Liverpool-Wellcome Trust Clinical Research Programme, University of Malawi - Malawi-Liverpool-Wellcome Trust Clinical Research Programme, Liverpool School of Tropical Medicine and Liverpool School of Tropical Medicine