RT Journal Article SR Electronic T1 Zonulin in serum as a biomarker fails to identify the IBS, functional dyspepsia and non-coeliac wheat sensitivity JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 1719 OP 1722 DO 10.1136/gutjnl-2019-318664 VO 69 IS 9 A1 Talley, Nicholas J A1 Holtmann, Gerald J A1 Jones, Michael A1 Koloski, Natasha A A1 Walker, Marjorie M A1 Burns, Grace A1 Potter, Michael D E A1 Shah, Ayesha A1 Keely, Simon YR 2020 UL http://gut.bmj.com/content/69/9/1719.abstract AB