GastritisGastric MucosaGastritis, AtrophicHelicobacter pyloriHelicobacter InfectionsMetaplasiaStomach UlcerPyloric AntrumStomach NeoplasmsStomachChronic DiseasePeptic UlcerPepsinogen AStomach DiseasesGastroscopyTooth ErosionAchlorhydriaGastric JuiceGastrinsDuodenal UlcerBiopsyDyspepsiaDuodenitisBile RefluxPepsinogen CGastritis, HypertrophicHelicobacterHelicobacter heilmanniiUreaseIntestinal MucosaHelicobacter felisPrecancerous ConditionsParietal Cells, GastricCampylobacterEndoscopy, GastrointestinalAtrophyAnti-Ulcer AgentsAntigens, BacterialPepsinogensBacterial ProteinsAmoxicillinGastric AcidOmeprazoleLymphoma, B-Cell, Marginal ZoneMouth MucosaAnemia, PerniciousAntibodies, BacterialDuodenumCampylobacter InfectionsH(+)-K(+)-Exchanging ATPaseLewis Blood-Group SystemImmunohistochemistryClarithromycinPostgastrectomy SyndromesPolymerase Chain ReactionGastric FundusAdenocarcinomaCytotoxinsEndoscopyGenotypeNasal MucosaGastric MucinsIntestinesChoristomaUterine Cervical ErosionDuodenogastric RefluxHyperplasiaEndoscopy, Digestive SystemMetacarpophalangeal JointImmunoglobulin GIntrinsic FactorMucous MembraneAcinonyxGastric Acidity DeterminationImmunoglobulin ADNA, BacterialAnti-Bacterial AgentsAutoimmune DiseasesCase-Control StudiesEpithelial CellsGastrointestinal HemorrhageDrug Therapy, CombinationPrevalenceBismuthMicroscopy, ElectronMexicoEnzyme-Linked Immunosorbent AssayGastrin-Secreting CellsDuodenal DiseasesRisk FactorsGerbillinaeGene Rearrangement, B-Lymphocyte, Heavy ChainPentagastrin