1. School
of Public Health, University of California, Berkeley, California 94720, United States
2. Civil
and Environmental Engineering, Tufts University, Medford, Massachusetts 02153, United States
3. Civil
and Environmental Engineering, Stanford University, Stanford, California 94305, United States
4. Infectious
Disease Division, International Centre for Diarrhoeal Disease Research, Bangladesh, Dhaka, 1212, Bangladesh
5. Water
Global Practice, World Bank, Washington, D.C. 20433, United States
6. Water
Global
Practice, World Bank, Dhaka, 1207, Bangladesh
7. Infectious Diseases & Geographic Medicine, Stanford University, Stanford, California 94305, United States