1. Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
2. 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
3. Department of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, Notre Dame, Indiana 46556, United States
4. Department of Disease Control, London School of Hygiene and Tropical Medicine, London WC1E 7HT, U.K.
5. Ministério da Saúde, Instituto Nacional de Saúde Maputo, Maputo 1100, Mozambique