RT Journal Article SR Electronic T1 Fundamentals of gastroenterology with self-assessment workbook JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 1431 OP 1431 DO 10.1136/gut.32.11.1431 VO 32 IS 11 A1 J H Baron YR 1991 UL http://gut.bmj.com/content/32/11/1431.abstract AB