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3. Assessment, endoscopy, and treatment in patients with acute severe ulcerative colitis during the COVID-19 pandemic (PROTECT-ASUC): a multicentre, observational, case-control study. (April 2021)

9. Vitamin D levels and mortality with SARS-COV-2 infection: a retrospective two-centre cohort study. Issue 1161 (6th September 2021)