1. International Center for Diarrheal Diseases Research, Bangladesh (icddr,b), Dhaka, Bangladesh
2. Department of Nutrition, University of California, Davis, CA, USA
3. Division of Infectious Diseases and Geographic Medicine, Stanford University, Stanford, CA, USA
4. Social and Behavioral Interventions (SBI) Program, Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA