1. University of Maryland School of Medicine, Baltimore, Maryland, USA
2. International Center for Diarrheal Disease Research, Dhaka, Bangladesh
3. University of Maryland, College Park, Maryland, USA
4. University of Maryland School of Medicine, Baltimore, Maryland, USAJohns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
5. Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
6. University of Maryland School of Medicine, Baltimore, Maryland, USAUniversity of Florida, Gainesville, Florida, USA