1. Department of Epidemiology, Harvard School of Public Health, Boston, MA
2. Department of Nutrition, Harvard School of Public Health, Boston, MA
3. Department of Internal Medicine, Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania
4. Department of Microbiology and Immunology, Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania
5. Channing Laboratory, Department of Medicine, Harvard Medical School, Boston, MA
6. Department of Biostatistics, Harvard School of Public Health, Boston, MA
7. Departments of Environmental Health Sciences and Epidemiology, University of Michigan School of Public Health, Ann Arbor, MI
8. Division of Gastroenterology and Nutrition, Children's Hospital Boston, Boston, MA