1. So Yoon Sim is a technical officer in the Department of Immunization, Vaccines, and Biologicals at the World Health Organization, in Geneva, Switzerland. She was a health economist and research associate in the Department of International Health, Johns Hopkins Bloomberg School of Public Health, in Baltimore, Maryland, when this work was performed. Sim and Elizabeth Watts share credit as co–first authors.
2. Elizabeth Watts () is a health economist and research associate in the Department of International Health and in the International Vaccine Access Center, Johns Hopkins Bloomberg School of Public Health. Watts and So Yoon Sim share credit as co–first authors.
3. Dagna Constenla is the director of Epidemiology and Health Outcomes at GSK Vaccines, Latin America and the Caribbean, in Panama City, Panama. She was an associate scientist in the Department of International Health, Johns Hopkins Bloomberg School of Public Health, when this work was performed.
4. Logan Brenzel is a senior program officer for economics and finance, Vaccine Delivery/Global Development, Bill & Melinda Gates Foundation, in Washington, D.C.
5. Bryan N. Patenaude is an assistant professor in the Department of International Health, Johns Hopkins Bloomberg School of Public Health.