Liverpool School of Tropical MedicineLiverpool School of Tropical Medicine - Department of Clinical SciencesWalimu, Liverpool School of Tropical Medicine, Centre de Recherches Médicales de Lambaréné, Komfo Anokye Teaching Hospital, Liverpool School of Tropical Medicine, World Health Organization (WHO), University of Exeter, affiliation not provided to SSRN, Walimu, Addis Ababa University, Addis Ababa, Ethiopia, University of Nigeria Teaching Hospital, University of Sierra Leone - College of Medicine and Allied Health Sciences, Douala General Hospital, Walimu, University of Malawi - Malawi-Liverpool-Wellcome Trust Clinical Research Programme, CHU Sourô Sanou - Service des Maladies Infectieuses et Tropicales, University of Nigeria Teaching Hospital, Sheikh Shakhbout Medical City and Liverpool School of Tropical Medicine