Cite
MLA Citation
Elsie M F Horne et al.. “Waning effectiveness of BNT162b2 and ChAdOx1 covid-19 vaccines over six months since second dose: OpenSAFELY cohort study using linked electronic health records.” BMJ, vol. 378, 2022, p. . http://access.bl.uk/ark:/81055/vdc_100160104045.0x000049