Esophageal Sphincter, LowerEsophageal Sphincter, UpperEsophagogastric JunctionTertiary PreventionDuodenostomyManometryDeglutitionSphincter of OddiEsophagusPeristalsisPressureEsophageal AchalasiaGastroesophageal RefluxOpossumsDeglutition DisordersMuscle RelaxationAnal CanalEsophageal pH MonitoringEsophageal Motility DisordersEsophagitisCricoid CartilagePharyngeal MusclesMuscle, SmoothMuscle ContractionMuscle TonusPharynxEsophagoscopyFundoplicationEsophageal DiseasesLaryngeal MusclesFluoroscopyHernia, HiatalStomachDiverticulum, EsophagealDidelphisSphincter of Oddi DysfunctionGastrointestinal MotilityMotilinAtropineEsophagitis, PepticFecal IncontinenceEsophageal StenosisGastrinsUrinary Sphincter, ArtificialCatsCatheterizationEructationDilatationBethanecholMethacholine CompoundsAnti-Dyskinesia AgentsHexamethonium CompoundsUrethraPhentolamineHydrochloric AcidVagus NerveBarrett EsophagusReflexEndoscopy, GastrointestinalElectric StimulationPropranololSecretinIrisCommon Bile Duct DiseasesDogsBaclofenVideo RecordingHydrogen-Ion ConcentrationLaparoscopyAmpulla of VaterLacerationsAcetylcholineAnus DiseasesRectumUrodynamicsFissure in AnoNitric Oxide