RT Journal Article SR Electronic T1 Proton pump inhibitor or famotidine use and severe COVID-19 disease: a propensity score-matched territory-wide study JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP gutjnl-2020-323668 DO 10.1136/gutjnl-2020-323668 A1 Jiandong Zhou A1 Xiansong Wang A1 Sharen Lee A1 William Ka Kei Wu A1 Bernard Man Yung Cheung A1 Qingpeng Zhang A1 Gary Tse YR 2020 UL http://gut.bmj.com/content/early/2020/12/08/gutjnl-2020-323668.abstract AB