Colonic DiseasesColonCrohn DiseaseEnemaColitis, UlcerativeColorectal NeoplasmsColonoscopyRectumIntestinal MucosaColonic NeoplasmsColonic Diseases, FunctionalColonic PolypsAdenomaBipolar DisorderColitisMental DisordersColorectal SurgeryAdenocarcinomaColorectal Neoplasms, Hereditary NonpolyposisAnxiety DisordersRectal NeoplasmsMood DisordersGastrointestinal TransitGastrointestinal MotilityDiverticulosis, ColonicColonic Pseudo-ObstructionIntestinal PolypsAdenomatous PolypsSigmoidoscopyDiagnostic and Statistical Manual of Mental DisordersColectomyHT29 CellsAzoxymethaneAdenomatous Polyposis ColiDextran SulfateDiverticulitis, ColonicImmunohistochemistryCase-Control StudiesDepressive Disorder, Major