RT Journal Article SR Electronic T1 Treatment of fistulas in Crohn’s disease with infliximab JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 642 OP 643 DO 10.1136/gut.45.5.642 VO 45 IS 5 A1 LÖFBERG, R YR 1999 UL http://gut.bmj.com/content/45/5/642.abstract AB