Colitis, UlcerativeColitisCrohn DiseaseMesalamineColonInflammatory Bowel DiseasesAminosalicylic AcidsIntestinal MucosaProctocolectomy, RestorativeColitis, IschemicDextran SulfateRectumColectomySulfasalazinePouchitisColitis, CollagenousIleostomyGastrointestinal AgentsTrinitrobenzenesulfonic AcidColonic PouchesColitis, MicroscopicColonoscopyEnemaColitis, LymphocyticAzathioprineCholangitis, SclerosingBiopsyPrednisoloneProctitisTreatment OutcomeMegacolon, ToxicColon, SigmoidAnti-Inflammatory Agents, Non-SteroidalAdministration, RectalIleitisAnti-Inflammatory AgentsIleumSigmoidoscopySeverity of Illness IndexFollow-Up StudiesTime FactorsRetrospective StudiesRecurrenceColonic DiseasesColonic NeoplasmsAcute DiseasePeroxidasePrognosisAdrenal Cortex HormonesCase-Control StudiesAntibodies, Antineutrophil CytoplasmicDisease ProgressionHLA-B52 AntigenImmunosuppressive AgentsDisease Models, AnimalProctocolitisFecesProspective StudiesDefecationFatal OutcomeChronic DiseaseRemission InductionRectal DiseasesIntestinesProbioticsNod2 Signaling Adaptor ProteinAnal CanalDysentery, AmebicImmunohistochemistryIntestine, LargePyoderma GangrenosumAdministration, OralInflammationDiarrheaRemission, SpontaneousRisk FactorsFecal IncontinenceDouble-Blind MethodAnastomosis, SurgicalSteroidsPrecancerous ConditionsBiological MarkersPhenylhydrazinesAge of Onset6-MercaptopurineColorectal NeoplasmsCytokinesGenetic Predisposition to DiseaseAntibodies, MonoclonalDiverticulum, ColonSulfapyridineMice, Inbred C57BLTumor Necrosis Factor-alphaPostoperative ComplicationsAutoantibodiesPhosphorothioate OligonucleotidesOxazoloneMethylprednisoloneGastrointestinal HemorrhageCohort Studies