1. World Health Assembly resolution WHA27.57; 1974.
2. UNICEF, WHO. Progress and Challenges with Achieving Universal Immunization Coverage: 2020 WHO/UNICEF Estimates of National Immunization Coverage; 2021.
3. Global Vaccine Action Plan 2011–2020;World Health Organization,2013
4. 2021: the beginning of a new era of immunisations?;Lancet;The Lancet,2021
5. Home n.d. [accessed February 20, 2022].