1. World Health Organization. Immunization agenda 2030: a global strategy to leave no one behind. Geneva, Switzerland: World Health Organization; 2020. https://immunizationagenda2030.org
2. Status of new vaccine introduction—worldwide, September 2016.;Loharikar;MMWR Morb Mortal Wkly Rep,2016
3. World Health Organization. Immunization dashboard. Geneva, Switzerland: World Health Organization; 2023. Accessed June 2, 2023. https://immunizationdata.who.int
4. World Health Organization. Table 1: summary of WHO position papers—recommendations for routine immunizations. Geneva, Switzerland: World Health Organization; 2023. https://cdn.who.int/media/docs/default-source/immunization/immunization_schedules/table_1_feb_2023_english.pdf?sfvrsn=c7de0e97_11&download=true
5. World Bank. World Bank country classifications. Washington, DC: World Bank; 2022. Accessed June 2, 2023. https://view.officeapps.live.com/op/view.aspx?src=https%3A%2F%2Fdatacatalogfiles.worldbank.org%2Fddh-published%2F0037712%2FDR0090755%2FCLASS.xlsx&wdOrigin=BROWSELINK