title: Letter: smoking as a modifiable risk factor for a complicated course in Crohn's disease.
authors.affiliation: Leeds Gastroenterology Institute, St. James's University Hospital, Leeds, UK.|Leeds Institute of Biomedical and Clinical Sciences, University of Leeds, Leeds, UK.
authors.forename: N
authors.initials: N
authors.lastname: To
authors.affiliation: Leeds Gastroenterology Institute, St. James's University Hospital, Leeds, UK.|Leeds Institute of Biomedical and Clinical Sciences, University of Leeds, Leeds, UK.
authors.forename: D J
authors.initials: DJ
authors.lastname: Gracie
authors.affiliation: Leeds Gastroenterology Institute, St. James's University Hospital, Leeds, UK. alexf12399@yahoo.com.|Leeds Institute of Biomedical and Clinical Sciences, University of Leeds, Leeds, UK. alexf12399@yahoo.com.
authors.forename: A C
authors.initials: AC
authors.lastname: Ford
mesh_terms: D003093:Colitis, Ulcerative / Q000503:physiopathology*; D003424:Crohn Disease / Q000503:physiopathology*; D005260:Female; D006801:Humans; D015212:Inflammatory Bowel Diseases / Q000503:physiopathology*; D008297:Male; D012907:Smoking / Q000453:epidemiology*