RT Journal Article SR Electronic T1 Gut to lung JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 544 OP 545 DO 10.1136/gutjnl-2015-310599 VO 65 IS 4 A1 Sylvia Knapp YR 2016 UL http://gut.bmj.com/content/65/4/544.abstract AB