1. Division of Infectious Diseases and Geographic Medicine, Stanford University, Stanford, California, USA
2. Division of Epidemiology and Biostatistics, School of Public Health, University of California, Berkeley, Berkeley, California, USA
3. Infectious Diseases Division, International Centre for Diarrhoeal Disease Research, Bangladesh, Dhaka, Bangladesh
4. Francis I. Proctor Foundation, University of California, San Francisco, San Francisco, California, USA
5. Division of Infectious Diseases and International Health, University of Virginia, Charlottesville, Virginia, USA
6. Department of Statistics, Stanford University, Stanford, California, USA
7. Institute for Global Nutrition, University of California, Davis, Davis, California, USA