Comparative safety and effectiveness of Pfizer BA.4-5 versus Sanofi during the spring 2023 COVID-19 booster vaccination programme in England: a matched cohort study in OpenSAFELY-TPPColm D. Andrews,
Em Prestige,
Edward P.K. Parker,
Venexia Walker,
Tom Palmer,
Andrea L Schaffer,
Amelia C.A. Green,
Amir Mehrkar,
Brian MacKenna,
Sebastian C.J. Bacon,
Ben Goldacre,
Miguel A. Hernán,
Jonathan A.C. Sterne,
the OpenSAFELY collaborative,
William J. Hulme