Ifakara Health Institute - Environmental Health and Ecological Sciences Department, University of Glasgow - Boyd Orr Centre for Population and Ecosystem Health, University of Glasgow, Ifakara Health Institute - Environmental Health and Ecological Sciences Department, University of Glasgow, University of Glasgow, Ifakara Health Institute, affiliation not provided to SSRN, Ifakara Health Institute, Ifakara Health Institute - Environmental Health and Ecological Sciences Department, Sokoine University of Agriculture, Sokoine University of Agriculture, Ifakara Health Institute - Environmental Health and Ecological Sciences Department, Washington State University - School of Economic Sciences, Washington State University and University of Glasgow - Boyd Orr Centre for Population and Ecosystem Health