RT Journal Article SR Electronic T1 Mucus and mucosa JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 982 OP 983 DO 10.1136/gut.26.9.982-b VO 26 IS 9 A1 Rees, W D W YR 1985 UL http://gut.bmj.com/content/26/9/982.3.abstract AB