title: A review of environmental factors and Crohn's disease.
mesh_terms: D003424:Crohn Disease / Q000209:etiology*; D005247:Feeding Behavior; D005549:Foreign-Body Reaction / Q000150:complications; D006801:Humans; D014385:Tuberculosis, Gastrointestinal / Q000150:complications; D014777:Virus Diseases / Q000150:complications