Gastroesophageal RefluxEsophageal Sphincter, LowerGastritisGastritis, AtrophicBile RefluxDuodenogastric RefluxHelicobacter pyloriVesico-Ureteral RefluxHelicobacter InfectionsGastric MucosaEsophagitis, PepticPyloric AntrumStomachEsophagusGastroscopyMetaplasiaGastritis, HypertrophicLaryngopharyngeal RefluxEsophagitisPepsinogen AEsophageal pH MonitoringStomach NeoplasmsAchlorhydriaHeartburnManometryGastric Acidity DeterminationProton Pump InhibitorsGastric AcidGastrinsStomach UlcerVenous InsufficiencyHernia, HiatalEndoscopy, GastrointestinalAnti-Ulcer AgentsPeptic UlcerEsophagogastric JunctionOmeprazoleAntacidsChronic DiseaseStomach DiseasesEsophagoscopyDyspepsiaDuodenal UlcerBarrett EsophagusGastric JuicePepsinogen CPostgastrectomy SyndromesFundoplicationHelicobacter felisEndoscopyHelicobacter heilmanniiBiopsyParietal Cells, GastricDuodenitisAnemia, PerniciousEndoscopy, Digestive System2-PyridinylmethylsulfinylbenzimidazolesHydrogen-Ion ConcentrationHelicobacterUreaseGastric FundusVaricose VeinsPepsinogensPrecancerous ConditionsGastric EmptyingPeristalsisLansoprazoleLaryngitisAtrophyCisaprideGastroenterostomyUltrasonography, Doppler, DuplexCampylobacterEructation