RT Journal Article SR Electronic T1 Helicobacter pylori JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 723 OP 723 DO 10.1136/gut.41.5.723-f VO 41 IS 5 A1 S MOSS YR 1997 UL http://gut.bmj.com/content/41/5/723.6.abstract AB