Cite
MLA Citation
Sara Y Tartof et al.. “Effectiveness of mRNA BNT162b2 COVID-19 vaccine up to 6 months in a large integrated health system in the USA: a retrospective cohort study.” Lancet, vol. 398, no. 10309, 2021, pp. 1407–1416. http://access.bl.uk/ark:/81055/vdc_100160127751.0x000056