Letter: Surgery in Crohn's disease.
D003424:Crohn Disease / Q000150:complications / Q000601:surgery*; D004386:Duodenum / Q000601:surgery; D005401:Fissure in Ano / Q000150:complications / Q000601:surgery; D006801:Humans; D008197:Lymph Node Excision; D014517:Ureteral Obstruction / Q000150:complications