RT Journal Article SR Electronic T1 A fatal case of COVID-19 pneumonia occurring in a patient with severe acute ulcerative colitis JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 1148 OP 1149 DO 10.1136/gutjnl-2020-321183 VO 69 IS 6 A1 Stefano Mazza A1 Andrea Sorce A1 Flora Peyvandi A1 Maurizio Vecchi A1 Flavio Caprioli YR 2020 UL http://gut.bmj.com/content/69/6/1148.abstract AB