National Institute for Medical Research (NIMR), National Institute for Medical Research (NIMR), National Institute for Medical Research (NIMR), Brown University, National Institute for Medical Research (NIMR) - Tanga Research Centre, National Institute for Medical Research (NIMR), National Institute for Medical Research (NIMR) - Tanga Research Centre, National Institute for Medical Research (NIMR), National Institute for Medical Research (NIMR), Ministry of Health and Social Welfare, Tanzania - National Malaria Control Programme (NMCP), Ministry of Health and Social Welfare, Tanzania - National Malaria Control Programme (NMCP), Ministry of Health and Social Welfare, Tanzania - National Malaria Control Programme (NMCP), Ministry of Health and Social Welfare, Tanzania - National Malaria Control Programme (NMCP), Ministry of Health and Social Welfare, Tanzania - National Malaria Control Programme (NMCP), Ministry of Health and Social Welfare, Tanzania - National Malaria Control Programme (NMCP), Muhimbili University of Health and Allied Sciences, World Health Organization (WHO), World Health Organization (WHO), Brown University, University of North Carolina (UNC) at Chapel Hill - Department of Epidemiology and University of Gothenburg