1. Program in Global Disease Epidemiology and Control, Department of International Health, Bloomberg School of Public Heath, Johns Hopkins University, Baltimore, MD
2. Fogarty International Center, National Institutes of Health, Bethesda, MD
3. Center for Global Health, University of Virginia School of Medicine, Charlottesville, VA
4. Department of Gastrointestinal Sciences, Christian Medical College, Vellore, Tamil Nadu, India
5. Instituto de Investigación Nutricional, Lima, Peru
6. Epidemiology Division, Statens Serum Institut, Copenhagen, Denmark