1. Department of Environmental Sciences and Engineering, Gillings School of Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States of America
2. Waterborne Disease Prevention Branch, Division of Foodborne, Waterborne, and Environmental Diseases, National Center for Emerging Zoonotic and Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia 30329, United States of America
3. Department of Disease Control, London School of Hygiene and Tropical Medicine, London, WC1E 7HT, United Kingdom
4. Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States of America
5. Civil and Environmental Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, Georgia 30332, United States of America
6. Environmental and Occupational Health Sciences, University of Washington, 2980 15th Ave NE, Seattle, Washington 98195, United States of America
7. Ministério da Saúde, Instituto Nacional de Saúde Maputo, Maputo, Mozambique
8. Department of Biostatistics and Bioinformatics, Emory University, Atlanta, Georgia 30322, United States of America