Helicobacter pyloriGastritis, AtrophicHelicobacter InfectionsGastric AcidGastritisOmeprazoleAnti-Ulcer AgentsGastric MucosaAmoxicillinClarithromycin2-PyridinylmethylsulfinylbenzimidazolesGastrinsBismuthDuodenal UlcerMetronidazoleLansoprazolePentagastrinTinidazoleProton Pump InhibitorsGastric JuicePeptic UlcerDyspepsiaStomachDrug Therapy, CombinationRanitidineAnti-Bacterial AgentsPepsinogen AParietal Cells, GastricAchlorhydriaStomach NeoplasmsGastroscopyStomach UlcerRabeprazoleHelicobacterPyloric AntrumAntacidsFurazolidoneHistamine H2 AntagonistsBreath TestsMetaplasiaUreaseSulfoxidesAntitrichomonal AgentsPepsinogen CBethanechol CompoundsGastric Acidity DeterminationPenicillinsStomach DiseasesBenzimidazolesHistamineSecretory RatePepsinogensLymphoma, B-Cell, Marginal ZoneGastroesophageal RefluxEsophagitis, PepticCimetidineEndoscopy, GastrointestinalAnemia, PerniciousPeptonesH(+)-K(+)-Exchanging ATPaseTetracyclineAminopyrineVagotomyFamotidineDuodenitisUreaTreatment OutcomeEsomeprazoleBacterial ProteinsMetiamideTetragastrinEsophagitisOrganometallic CompoundsEndoscopyGastric FistulaEnterochromaffin-like CellsLevofloxacinProspective StudiesPrecancerous ConditionsVagotomy, Proximal GastricAntigens, BacterialNifuratelYogurtBiopsyVagus NerveBethanecholAntibodies, BacterialAnti-Infective AgentsGastric FundusPylorusHydrogen-Ion ConcentrationDisease EradicationOfloxacinSomatostatinZollinger-Ellison SyndromeDrug Administration ScheduleGastric EmptyingDanazolRifabutinChronic Disease