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Doherty, J. et al. (n.d.). P040 Reduced serological response to COVID-19 vaccines in patients with IBD is further diminished by TNF inhibitor therapy; Early results of the VARIATION study (VAriability in Response in IBD Against SARS-COV-2 ImmunisatiON). Journal of Crohn's and colitis. pp. i156-i157. [Online].