University of Basel - Swiss Tropical and Public Health Institute, 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), University of Basel - Swiss Tropical and Public Health Institute, University of Basel - Swiss Tropical and Public Health Institute, University of Basel - Swiss Tropical and Public Health Institute, University of Basel - Swiss Tropical and Public Health Institute, University of Basel - Swiss Tropical and Public Health Institute, University of Basel - Swiss Tropical and Public Health Institute and University of Basel - Swiss Tropical and Public Health Institute