RT Journal Article SR Electronic T1 An unexpected cause of iron deficiency JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 1434 OP 1579 DO 10.1136/gutjnl-2020-321830 VO 70 IS 8 A1 Conley, Thomas Edward A1 Andrews, Timothy A1 Arumainathan, Arvind A1 O'Toole, Paul A1 Smith, Philip J A1 Subramanian, Sreedhar YR 2021 UL http://gut.bmj.com/content/70/8/1434.abstract AB