RT Journal Article SR Electronic T1 Evolving Concepts in Gastrointestinal Motility JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 809 OP 809 DO 10.1136/gut.40.6.809 VO 40 IS 6 A1 R C Spiller YR 1997 UL http://gut.bmj.com/content/40/6/809.1.abstract AB