1. Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York 10964, United States
2. Department of Geology, University of Dhaka, Dhaka, Bangladesh
3. Department of Environmental Sciences and Engineering, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
4. Department of Civil Engineering and Engineering Mechanics, Columbia University, New York, New York 10027, United States
5. Department of Geography, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
6. Department of Earth and Environmental Engineering, Columbia University, New York, New York 10027, United States
7. Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, Tennessee 37996, United States
8. Center for Environmental Biotechnology, University of Tennessee, Knoxville, Tennessee 37996, United States
9. Department of Environmental Sciences, Barnard College, New York, New York 10027, United States
10. International Centre for Diarrhoeal Research, Bangladesh, Dhaka, Bangladesh