1. Department of International Health, Johns Hopkins University, Bloomberg School of Public Health, Baltimore, MD, USA
2. Jhpiego, Nairobi, Kenya
3. Berman Institute of Bioethics, Johns Hopkins University, Bloomberg School of Public Health, Baltimore, MD, USA
4. International Vaccine Access Center, Johns Hopkins University, Bloomberg School of Public Health, Baltimore, MD, USA
5. Department of Health, Behavior, and Society, Johns Hopkins University, Bloomberg School of Public Health, Baltimore, MD, USA
6. Center for Immunization Research, Department of Epidemiology, Johns Hopkins University, Bloomberg School of Public Health, Baltimore, MD, USA
7. Department of Epidemiology, Johns Hopkins University, Bloomberg School of Public Health, Baltimore, MD, USA