GastritisGastritis, AtrophicHelicobacter pyloriHelicobacter InfectionsGastric MucosaStomach UlcerDuodenal UlcerPeptic UlcerMetaplasiaChronic DiseaseStomach NeoplasmsPyloric AntrumStomachPepsinogen AAchlorhydriaGastroscopyDyspepsiaLeg UlcerDuodenitisPressure UlcerBiopsyPepsinogen CGastrinsSkin UlcerGastric JuiceStomach DiseasesHelicobacter heilmanniiBile RefluxHelicobacterUreaseCampylobacterPeptic Ulcer HemorrhageAtrophyAnti-Ulcer AgentsHelicobacter felisPrecancerous ConditionsAntigens, BacterialEndoscopy, GastrointestinalGastritis, HypertrophicAmoxicillinBacterial ProteinsLymphoma, B-Cell, Marginal ZonePeptic Ulcer PerforationOmeprazoleClarithromycinCampylobacter InfectionsBuruli UlcerAntibodies, BacterialLewis Blood-Group SystemCytotoxinsPolymerase Chain ReactionDuodenumGenotypeImmunohistochemistryParietal Cells, GastricAnemia, PerniciousAdenocarcinomaGastric AcidPepsinogensIntestinesAnti-Bacterial AgentsMexicoGene Rearrangement, B-Lymphocyte, Heavy ChainDNA, BacterialPostgastrectomy SyndromesImmunoglobulin GEndoscopyDrug Therapy, CombinationPrevalenceHyperplasiaImmunoglobulin ARisk FactorsCase-Control StudiesDiabetic FootInterleukin-1betaProspective StudiesGastroenterostomyFollow-Up StudiesPolymorphism, GeneticBismuthEnzyme-Linked Immunosorbent AssayGastric Acidity DeterminationCimetidineAntacidsSeverity of Illness IndexAcinonyxVagotomy