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Abdominal PainPainChronic PainPain ManagementAbdomen, AcutePain ThresholdPain, PostoperativePain MeasurementBack PainPain, IntractableLow Back PainNeck PainPelvic PainAcute PainPain PerceptionAppendicitisFacial PainIrritable Bowel SyndromePain, ReferredGastrointestinal DiseasesConstipationIleal DiseasesShoulder PainTorsion AbnormalityAbdomenTreatment OutcomeTomography, X-Ray ComputedMusculoskeletal PainColonic Diseases, FunctionalChronic DiseaseIntestinal ObstructionRadiography, AbdominalColitis, IschemicPancreatitisAnalgesicsVisceral PainIntestinal PerforationCecal DiseasesIntussusceptionJejunal DiseasesColonic DiseasesRupture, SpontaneousNeuralgiaNociceptive PainLaparotomyPancreatitis, ChronicAcute DiseaseAnalgesics, OpioidRetrospective StudiesFlatulenceProspective StudiesDiarrheaAppendectomyEndoscopy, Digestive SystemHemoperitoneumVomitingAppendixMesenteric Vascular OcclusionRecurrenceColicHyperalgesiaLaparoscopyFollow-Up StudiesDiverticulitisCholecystitisQuestionnairesDefecationDiagnostic ErrorsEndoscopy, GastrointestinalColonoscopyDouble-Blind MethodFatal OutcomeSeverity of Illness IndexPeritonitis, TuberculousMesenteric LymphadenitisDuodenal DiseasesMyofascial Pain SyndromesIntestinal DiseasesArthralgiaHymenComplex Regional Pain SyndromesHematocolposTime FactorsHeadacheMesenteric Artery, SuperiorFlank PainPeritoneal DiseasesPurpura, Schoenlein-HenochGastrointestinal AgentsVisceral AfferentsCholangiopancreatography, Endoscopic RetrogradeCeliac ArteryEnteritisNauseaAnalgesiaSplenic DiseasesAbdominal AbscessHerniaLabor PainSplenic Infarction