1. Center for World Health, David Geffen School of Medicine at University of California, Los Angeles (UCLA);
2. Division of Infectious Diseases and International Health, Department of Medicine, University of Virginia, Charlottesville;
3. Vaccine Testing Center and Unit of Infectious Diseases, Department of Medicine, University of Vermont College of Medicine, Burlington;
4. Centers for Disease Control and Prevention, Atlanta, Georgia;
5. Center for Vaccine Science and Parasitology Lab, International Centre for Diarrhoeal Disease Research, Bangladesh, Dhaka