MetaplasiaIncidenceBarrett EsophagusPrecancerous ConditionsGastric MucosaGastritisStomach NeoplasmsGastritis, AtrophicGoblet CellsEsophagusPrimary MyelofibrosisCardiaHelicobacter InfectionsStomachHelicobacter pyloriMucinsDuodenitisAdenocarcinomaIntestinesMucin 5ACOssification, HeterotopicEsophagoscopyRisk FactorsGastroscopyBiopsyMucous MembraneEsophageal NeoplasmsMucin-2Pyloric AntrumMucin-6Chief Cells, GastricEsophagogastric JunctionRetrospective StudiesEpitheliumProspective StudiesImmunohistochemistryFollow-Up StudiesGastroesophageal RefluxTime FactorsMucusStomach DiseasesDuodenumHyperplasiaStomach UlcerGastric MucinsCohort StudiesKeratin-7Treatment OutcomeDuodenal UlcerRespiratory MucosaEndoscopy, GastrointestinalApocrine GlandsKeratin-20Infant, NewbornAge DistributionBile RefluxHelicobacter felisKeratinsCell Transformation, NeoplasticPrevalenceRegistriesBronchiDisease Progression