RT Journal Article SR Electronic T1 Methotrexate in Crohn's disease JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 790 OP 791 DO 10.1136/gut.48.6.790 VO 48 IS 6 A1 D S Rampton YR 2001 UL http://gut.bmj.com/content/48/6/790.abstract AB