Helicobacter pyloriHelicobacter InfectionsGastritis, AtrophicGastritisGastric MucosaAtrophyStomach NeoplasmsPepsinogen AStomachUreasePepsinogen CHelicobacterPeptic UlcerAmoxicillinDyspepsiaClarithromycinAnti-Ulcer AgentsOmeprazoleMetronidazolePepsinogensDuodenal UlcerBreath TestsGastroscopyMetaplasiaAntibodies, BacterialStomach DiseasesPyloric AntrumBismuthStomach UlcerGastrinsAntigens, Bacterial2-PyridinylmethylsulfinylbenzimidazolesBacterial ProteinsAnti-Bacterial AgentsDrug Therapy, CombinationProton Pump InhibitorsEndoscopy, GastrointestinalParietal Cells, GastricUreaLansoprazoleTinidazoleBiopsyDuodenitisHelicobacter felisRanitidineCardiaFurazolidonePrecancerous ConditionsGastric AcidGerbillinaeRabeprazoleCase-Control StudiesAntitrichomonal AgentsRisk FactorsImmunoglobulin GPeptic Ulcer HemorrhagePrevalenceSeroepidemiologic StudiesEndoscopy, Digestive SystemLymphoma, B-Cell, Marginal ZoneMuscular AtrophyTetracyclinePenicillinsEnzyme-Linked Immunosorbent AssayHelicobacter hepaticusSulfoxidesAzure StainsHelicobacter heilmanniiSensitivity and SpecificityGastroesophageal RefluxLewis Blood-Group SystemAntacidsAchlorhydriaEndoscopyGastric MucinsPolymerase Chain ReactionJapanOrganometallic CompoundsGastrointestinal DiseasesAdenocarcinomaGastric JuiceDNA, BacterialSerologic TestsChronic DiseaseGastric Acidity DeterminationProspective StudiesEsophagitisProtein Tyrosine Phosphatase, Non-Receptor Type 11BenzimidazolesFecesEsophagitis, PepticVirulenceEpithelial CellsDuodenoscopyMolecular Sequence DataTreatment OutcomeOptic AtrophyEsomeprazoleLevofloxacinDrug Resistance, Bacterial