Wellcome Trust Intermediate Fellowship in Public Health and Tropical Medicine [201900]; Wellcome Trust [095066]; Bill and Melinda Gates Foundation [OPP1119467, OPP1093011, OPP1106023, OPP1132415]; MRC [MR/J008621/1] Funding Source: UKRI; Medical Research Council [MR/J008621/1] Funding Source: researchfish