RT Journal Article SR Electronic T1 Practical paediatric gastroenterology JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 692 OP 692 DO 10.1136/gut.25.6.692 VO 25 IS 6 A1 Alexander S Ncneish YR 1984 UL http://gut.bmj.com/content/25/6/692.1.abstract AB