RT Journal Article SR Electronic T1 Natural history of early gastric cancer JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 609 OP 609 DO 10.1136/gut.47.5.609 VO 47 IS 5 A1 A AXON YR 2000 UL http://gut.bmj.com/content/47/5/609.abstract AB