1. Department of Medicine, Division of Infectious Diseases and International Health, University of Virginia, Charlottesville
2. International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh
3. Department of Statistics, Charlottesville
4. Division of Biostatistics, Department of Public Health Sciences, School of Medicine, University of Virginia, Charlottesville
5. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland