EsophagusBarrett EsophagusEndoscopyEndoscopy, GastrointestinalCapsule EndoscopyEndoscopy, Digestive SystemEsophageal NeoplasmsEsophagoscopyEsophageal DiseasesGastroscopyEndoscopes, GastrointestinalGastroesophageal RefluxGastrointestinal HemorrhageEsophagitisEsophageal StenosisEndoscopesMetaplasiaEsophagogastric JunctionEsophagectomyCardiaEsophagitis, PepticCapsule EndoscopesAdenocarcinomaUpper Gastrointestinal TractPrecancerous ConditionsMucous MembraneColonoscopyGastrointestinal DiseasesDuodenoscopyEsophagoplastyGastroenterologyHernia, HiatalStomach DiseasesManometryEsophageal PerforationBiopsyFiber Optic TechnologyStomachDeglutition DisordersHelicobacter InfectionsStomach NeoplasmsDyspepsiaHelicobacter pyloriPeristalsisNarrow Band ImagingMelenaHemostasis, EndoscopicCausticsForeign BodiesCarcinoma, Squamous CellEsophageal AchalasiaPeptic Ulcer HemorrhageEsophageal FistulaDuodenumGastric MucosaEsophageal Sphincter, LowerDuodenal UlcerRetrospective StudiesEsophagoscopesGastrointestinal NeoplasmsHematemesisHypopharynxPeptic UlcerStomach UlcerDeglutitionEosinophilic EsophagitisIntestinal DiseasesEsophageal and Gastric VaricesDimethylnitrosamineConscious SedationDilatationBarium SulfateUlcerDouble-Balloon EnteroscopyGastritisFundoplicationProspective StudiesIntestine, SmallEsophageal pH MonitoringTreatment OutcomeGastroscopesPolypsBurns, ChemicalOmeprazoleAnti-Ulcer AgentsProton Pump InhibitorsDiverticulum, EsophagealJejunal DiseasesHeartburnDuodenogastric RefluxHydrochloric AcidEndosonographyColonoscopesSigmoidoscopyLaryngopharyngeal RefluxGastrectomyColonic PolypsSensitivity and SpecificityBile RefluxCapsules