1. Public Health Institute, Via United States Agency for International Development’s Global Health Training, Advisory and Support Contract (GHTASC) Project, Washington, DC 20024, USA
2. Department of Global and Environmental Health, New York University, New York, NY 10003, USA
3. Jhpiego, The Johns Hopkins University Affiliate, Baltimore, MD 21231, USA
4. Ministry of Health, Corrientes W3400, Argentina
5. High Impact Countries, Country Programmes Delivery, Gavi, The Vaccine Alliance, 1218 Geneva, Switzerland
6. Special Programme on Primary Health Care, World Health Organization, 1211 Geneva, Switzerland
7. Health Workforce Department, World Health Organization, 1211 Geneva, Switzerland
8. Ministry of Health, Expanded Program on Immunization, Monrovia 1000, Liberia
9. Federal Directorate of Immunization, Government of Pakistan, Islamabad 44000, Pakistan
10. Independent Researcher, Arlington, VA 22207, USA