GastritisHelicobacter pyloriGastritis, AtrophicHelicobacter InfectionsGastric MucosaHelicobacterMetaplasiaPyloric AntrumStomachStomach NeoplasmsChronic DiseasePeptic UlcerStomach UlcerPepsinogen AGastroscopyUreaseAchlorhydriaHelicobacter heilmanniiDyspepsiaStomach DiseasesGastritis, HypertrophicPepsinogen CDuodenitisGastrinsBiopsyBile RefluxDuodenal UlcerAntigens, BacterialGastric JuiceAmoxicillinAnti-Ulcer AgentsBacterial ProteinsHelicobacter felisEndoscopy, GastrointestinalCampylobacterPrecancerous ConditionsOmeprazoleClarithromycinAtrophyAntibodies, BacterialParietal Cells, GastricHelicobacter hepaticusLymphoma, B-Cell, Marginal ZonePepsinogensAnemia, PerniciousPolymerase Chain ReactionMetronidazoleCampylobacter InfectionsLewis Blood-Group SystemBismuthAnti-Bacterial AgentsCytotoxinsPostgastrectomy SyndromesGastric AcidGenotypeEndoscopyAcinonyxDNA, BacterialDrug Therapy, Combination2-PyridinylmethylsulfinylbenzimidazolesDuodenumImmunohistochemistryPrevalenceRisk FactorsEndoscopy, Digestive SystemImmunoglobulin GLansoprazoleH(+)-K(+)-Exchanging ATPaseBreath TestsProspective StudiesAdenocarcinomaProton Pump InhibitorsGastric FundusGerbillinaeRetrospective StudiesGastric Acidity DeterminationAntacidsIntestinesCase-Control StudiesMolecular Sequence DataAutoimmune DiseasesDuodenogastric RefluxEnzyme-Linked Immunosorbent AssaySensitivity and SpecificityGastrointestinal DiseasesFollow-Up StudiesIntrinsic FactorHyperplasiaEsophagitisGastroenterostomyImmunoglobulin AGastroesophageal RefluxTinidazole