1. Department of Epidemiology & Biostatistics; University of Georgia; Athens GA USA
2. Department of Nutrition; Harvard School of Public Health; Boston MA USA
3. Division of Gastroenterology and Nutrition; Children's Hospital; Boston MA USA
4. Department of Pediatrics and Child Health; School of Medicine; Muhimbili University of Health and Allied Sciences; Dar es Salaam Tanzania
5. Department of Epidemiology; Harvard School of Public Health; Boston MA USA
6. Department of Biostatistics; Harvard School of Public Health; Boston MA USA
7. Center for Biostatistics in AIDS Research; Harvard School of Public Health; Boston MA USA
8. United Nations Children's Fund; Regional Office for West and Central Africa; Dakar Senegal
9. Department of Microbiology and Immunology; Muhimbili University of Health and Allied Sciences; Dar es Salaam Tanzania
10. Department of Global Health and Population; Harvard School of Public Health; Boston MA USA