GastritisGastric MucosaGastritis, AtrophicIrritantsHelicobacter pyloriHelicobacter InfectionsMetaplasiaPyloric AntrumStomach UlcerStomach NeoplasmsDermatitis, IrritantStomachChronic DiseasePepsinogen APeptic UlcerGastroscopyStomach DiseasesAchlorhydriaGastric JuiceGastrinsDuodenal UlcerBiopsyDyspepsiaBile RefluxPepsinogen CDuodenitisGastritis, HypertrophicHelicobacterHelicobacter heilmanniiUreaseIntestinal MucosaHelicobacter felisPrecancerous ConditionsParietal Cells, GastricCampylobacterAtrophyEndoscopy, GastrointestinalAnti-Ulcer AgentsAntigens, BacterialPepsinogensBacterial ProteinsAmoxicillinGastric AcidLymphoma, B-Cell, Marginal ZoneOmeprazoleMouth MucosaAnemia, PerniciousAntibodies, BacterialCampylobacter InfectionsDuodenumH(+)-K(+)-Exchanging ATPaseLewis Blood-Group SystemImmunohistochemistryClarithromycinPostgastrectomy SyndromesGastric FundusPolymerase Chain ReactionNasal MucosaDermatitis, OccupationalAdenocarcinomaDermatitis, Allergic ContactCytotoxinsEndoscopyGastric MucinsGenotypeIntestinesChoristomaDuodenogastric RefluxHyperplasiaPatch TestsEndoscopy, Digestive SystemIntrinsic FactorAcroleinImmunoglobulin GHydrochloric AcidAcinonyxGastric Acidity DeterminationMucous MembraneImmunoglobulin ADNA, BacterialAnti-Bacterial AgentsAutoimmune DiseasesMustard PlantEpithelial CellsCase-Control StudiesPrevalenceBismuthCapsaicinRisk FactorsDrug Therapy, CombinationMexicoGastrin-Secreting CellsEthanolGerbillinaeGene Rearrangement, B-Lymphocyte, Heavy ChainPentagastrin