1. Department of Epidemiology of Microbial Diseases, Yale School of Public Health, Yale University , New Haven, CT, USA
2. Department of Epidemiology, University of Washington , Seattle, WA, USA
3. Vaccine Product Delivery Research, Immunization, Vaccines and Biologicals, World Health Organization , Geneva, Switzerland
4. Departments of Global Health, Medicine, and Pediatrics, University of Washington , Seattle, WA, USA
5. Department of Epidemiology, Rollins School of Public Health, Emory University , Atlanta, GA, USA