1. Division of Infectious Diseases, Massachusetts General Hospital, and
2. Department of Medicine, Harvard Medical School, Boston, Massachusetts,
3. Division of Infectious Diseases, Department of Medicine, University of California, Irvine,
4. Division of Infectious Diseases, Department of Medicine, University of Utah School of Medicine, Salt Lake City,
5. Laboratory of Bioorganic Chemistry, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, and
6. Department of Immunology and Infectious Diseases, Harvard T.H. Chan School of Public Health, Boston, Massachusetts;
7. International Centre for Diarrhoeal Disease Research, Bangladesh (icddr,b), Dhaka; and
8. Department of Microbiology and Immunobiology, Harvard Medical School, Boston, Massachusetts