Sachar, David B Is perianal Crohn's disease associated with intestinal fistulization? [electronic resource] - The American journal of gastroenterology Jul 2005 - 1547-9 p. digital Publication Type: Journal Article; Research Support, Non-U.S. Gov't ISSN: 0002-9270 Standard No.: 10.1111/j.1572-0241.2005.40980.x doi Subjects--Topical Terms: Anus Diseases--complicationsColitis--complicationsColonic Diseases--complicationsCrohn Disease--complicationsDatabases, FactualHumansIleal Diseases--complicationsIntestinal Fistula--etiologyRisk