1. Department of Civil and Environmental Engineering, Tufts University, Medford, Massachusetts, USA
2. Department of Civil and Environmental Engineering, Stanford University, Stanford, California, USA
3. Department of Civil, Construction, and Environmental Engineering, North Carolina State University, Raleigh, North Carolina, USA
4. International Centre for Diarrhoeal Disease Research, Bangladesh, Dhaka, Bangladesh
5. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
6. Department of Civil and Environmental Engineering, University of California, Berkeley, Berkeley, California, USA