1. Hubert Department of Global Health and Department of Sociology, Emory University, 1518 Clifton Rd, NE, Atlanta, GA 30322, USA
2. Department of Health Science, Brigham Young University, Provo, UT, USA
3. Department of Psychology, Emory University, Atlanta, GA, USA
4. Division of Epidemiology and Community Health, University of Minnesota School of Public Health, Minneapolis, MN, USA
5. Mailman School of Public Health, Columbia University, New York, NY, USA
6. International Centre for Diarrheal Disease Research, Dhaka, Bangladesh
7. Independent Consultant, Washington, D.C., USA