1. Focusing on the implementation of 21st century vaccines for adults
2. Immunization Agenda 2030. Implementing the Immunization Agenda 2030. IA 2030. Accessed April 7, 2023. https://cdn.who.int/media/docs/default-source/immunization/strategy/ia2030/ia2030_frameworkforactionv04.pdf?sfvrsn=e5374082_1&download=true
3. World Health Organization. Immunization, Vaccines and Biologicals: WHO recommendations for routine immunization - summary tables. WHO; 2023. Accessed April 7, 2023. https://www.who.int/teams/immunization-vaccines-and-biologicals/policies/who-recommendations-for-routine-immunization---summary-tables
4. World Federation of Public Health Associations. Policy Statement on Vaccination of Older Adults. WFPHA; 2022. Accessed April 7, 2023. https://drive.infomaniak.com/app/share/141741/8c4e56c4-6620-4c77-8095-e967707d8c8a/files/40333/preview/pdf/46968
5. The World Bank. World Bank Country and Lending Groups. The World Bank; 2023. Accessed April 7, 2023. https://datahelpdesk.worldbank.org/knowledgebase/articles/906519-world-bank-country-and-lending-groups