1. Institute for Vaccine Safety, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
2. Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
3. Department of Health, Behavior and Society, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
4. Brighton Collaboration, A program of the Task Force for Global Health, Decatur, GA, USA
5. Global Vaccine Data Network, Auckland, New Zealand
6. Department of Health, Policy and Management, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA