1. Department of Forestry and Environmental Resources, North Carolina State University, Raleigh, North Carolina 27695, United States
2. School of Public Health, University of California, Berkeley, California 94720, United States
3. Infectious Disease Division, International Centre for Diarrhoeal Disease Research, Bangladesh, Dhaka, 1212, Bangladesh
4. University at Buffalo, Buffalo, New York 14214, United States
5. Rollins School of Public Health, Emory University, Atlanta, Georgia 30322, United States
6. Infectious Diseases & Geographic Medicine, Stanford University, Stanford, California 94305, United States