1. Division of Allergy and Infectious Diseases, Department of Medicine, University of Washington , Seattle, Washington , USA
2. Department of Global Health, University of Washington , Seattle, Washington , USA
3. Medical Research Department, Kenyatta National Hospital , Nairobi , Kenya
4. Department of Pediatrics and Department of Medicine, Baylor College of Medicine , Houston, Texas , USA
5. Department of Biostatistics, University of Washington , Seattle, Washington , USA
6. Division of Infectious Diseases, Department of Pediatrics, Emory University , Atlanta, Georgia , USA
7. Children’s Healthcare of Atlanta , Atlanta, Georgia , USA
8. Department of Pediatrics and Child Health, University of Nairobi , Nairobi , Kenya
9. Department of Reproductive Health, Kenyatta National Hospital , Nairobi , Kenya
10. Department of Epidemiology, University of Washington , Seattle, Washington , USA
11. Department of Pediatrics, University of Washington , Seattle, Washington , USA