1. COVID-19 Map - Johns Hopkins Coronavirus Resource Center. [cited 13 Apr 2021]. Available: 〈https://coronavirus.jhu.edu/map.html〉.
2. CDC. Risk for COVID-19 Infection, Hospitalization, and Death By Age Group. 22 Nov 2021 [cited 5 Jan 2022]. Available: 〈https://www.cdc.gov/coronavirus/2019-ncov/covid-data/investigations-discovery/hospitalization-death-by-age.html〉.
3. Learning loss due to school closures during the COVID-19 pandemic;Engzell;Proc. Natl. Acad. Sci. USA,2021
4. NAEP Mathematics: Mathematics Highlights 2022. [cited 31 Oct 2022]. Available: 〈https://www.nationsreportcard.gov/highlights/mathematics/2022/〉.
5. AAP-AACAP-CHA. AAP-AACAP-CHA Declaration of a National Emergency in Child and Adolescent Mental Health. [cited 5 Jan 2022]. Available: 〈https://www.aap.org/en/advocacy/child-and-adolescent-healthy-mental-development/aap-aacap-cha-declaration-of-a-national-emergency-in-child-and-adolescent-mental-health/?campaign_id=9&emc=edit_nn_20220104&instance_id=49344&nl=the-morning®i_id=74729905&segment_id=78602&te=1&user_id=c84f550bde2781b01d792e1c069a1ed7〉.