RT Journal Article SR Electronic T1 Oral ulceration and Behçet's syndrome. JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 491 OP 511 DO 10.1136/gut.18.6.491 VO 18 IS 6 A1 Lehner, T YR 1977 UL http://gut.bmj.com/content/18/6/491.abstract AB