1. Division of Infectious Diseases and International Health, Department of Medicine, School of Medicine, University of Virginia, Charlottesville, Virginia;
2. International Centre for Diarrhoeal Disease Research, Bangladesh, Dhaka, Bangladesh;
3. Division of Biostatistics, Department of Public Health Sciences, School of Medicine, University of Virginia, Charlottesville, Virginia;
4. Department of Medicine, University of Vermont, Burlington, Vermont;
5. Division of Developmental Medicine, Boston Children’s Hospital, Harvard Medical School, Boston, Massachusetts