Comparative effectiveness of BNT162b2 versus mRNA-1273 covid-19 vaccine boosting in England: matched cohort study in OpenSAFELY-TPP by Hulme, WJ, Horne, EMF, Parker, EPK, Keogh, RH, Williamson, EJ, Walker, V, Palmer, TM, Curtis, HJ, Walker, AJ, Andrews, CD, Mehrkar, A, Morley, J, MacKenna, B, Bacon, SCJ, Goldacre, B, Hernán, MA, Sterne, JAC

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