1. World Health Organization. National immunization coverage scorecards estimates for 2017 global immunization coverage in 2017; 2017. Available from: https://apps.who.int/iris/handle/10665/276969. Accessed February 3, 2022.
2. [No authors listed]. Measles vaccines: WHO position paper - April 2017. Wkly Epidemiol Rec. 2017;92(17):205–227.
3. World Health Organization. Surveillance guide for vaccine-preventable diseases in the WHO South-East Asia Region; 2017. Available from: https://apps.who.int/iris/rest/bitstreams/1168845/retrieve. Accessed February 3, 2022.
4. World Health Organization. Measles outbreaks strategic response plan 2021–2023; 2021. Available from: https://apps.who.int/iris/bitstream/handle/10665/340657/9789240018600-eng.pdf. Accessed February 3, 2022.
5. College Board. AP Program Participation and Performance Data 2020; 2020. Available from: https://research.collegeboard.org/programs/ap/data/participation/ap-2020. Accessed January 21, 2022.