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 Breadcrumbs UL Home Research Publications Year of Publication 2022 Journal Journal Of Crohns &Amp; Colitis DOI 10.1093/ecco-jcc/jjac029
