EsophagusBarrett EsophagusEsophageal NeoplasmsEsophagoscopyDuodenal NeoplasmsEsophageal DiseasesEsophageal StenosisMetaplasiaEsophagectomyEsophagogastric JunctionDuodenal DiseasesAdenocarcinomaGastroesophageal RefluxStomachCardiaEsophagoplastyMucous MembraneEsophagitisPrecancerous ConditionsPeristalsisDuodenal ObstructionEsophagitis, PepticManometryBrunner GlandsJejunumIntestine, SmallEndoscopy, GastrointestinalEsophageal PerforationIntestinal MucosaGastrointestinal MotilityHydrochloric AcidEndoscopy, Digestive SystemEsophageal FistulaDuodenoscopyDigestive SystemCarcinoma, Squamous CellEndoscopyDimethylnitrosamineIntestinesEsophageal Sphincter, LowerIleumUpper Gastrointestinal TractDeglutitionDuodenitisHypopharynxHernia, HiatalEsophageal AchalasiaDeglutition DisordersEsophagoscopesPylorusCausticsPyloric AntrumForeign BodiesBiopsyStomach NeoplasmsGastric MucosaIntestinal AbsorptionFundoplicationImmunohistochemistryMuscle, SmoothEsophageal Sphincter, UpperEsophageal AtresiaMyoelectric Complex, MigratingDilatationPancreasDiverticulum, EsophagealDigestionGastric EmptyingBurns, ChemicalBarium SulfateGastrointestinal NeoplasmsGastrointestinal TractSecretinAmpulla of VaterGastrectomyDuodenal UlcerAnastomosis, SurgicalFistulaPancreaticoduodenectomyDigestive System NeoplasmsIntubation, GastrointestinalDuodenogastric RefluxGastroscopyEosinophilic EsophagitisPancreatic JuiceEpitheliumRumenEpirizoleChoristomaVagus NerveTracheoesophageal FistulaStomach DiseasesEsophageal Motility DisordersButylscopolammonium BromideHydrogen-Ion ConcentrationGastrointestinal HemorrhageColonMuscle ContractionRetrospective StudiesGastric Outlet Obstruction