RT Journal Article SR Electronic T1 Bacteria as the cause of ulcerative colitis JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 132 OP 135 DO 10.1136/gut.48.1.132 VO 48 IS 1 A1 MASSIMO CAMPIERI A1 PAOLO GIONCHETTI YR 2001 UL http://gut.bmj.com/content/48/1/132.abstract AB