Duodenal UlcerHelicobacter pyloriHelicobacter InfectionsStomach UlcerPeptic UlcerGastritisGastric MucosaAnti-Ulcer AgentsPeptic Ulcer HemorrhageOmeprazolePeptic Ulcer PerforationAmoxicillinGastric JuiceDyspepsiaClarithromycinStomachRanitidineVagotomy, Proximal GastricGastric AcidGastrinsUreaseMetronidazolePyloric AntrumBismuthCimetidineStomach NeoplasmsGastritis, AtrophicVagotomyBreath TestsDuodenoscopyPylorusStomach DiseasesGastroscopyLeg UlcerDuodenumDuodenitisPressure UlcerGastric Acidity Determination2-PyridinylmethylsulfinylbenzimidazolesLansoprazolePepsinogensDrug Therapy, CombinationSkin UlcerHistamine H2 AntagonistsPentagastrinAntibodies, BacterialMetaplasiaEndoscopy, GastrointestinalAnti-Bacterial AgentsDumping SyndromeProton Pump InhibitorsPepsinogen AAntacidsFurazolidoneTinidazoleBiopsyUreaBacterial ProteinsEndoscopyGastroenterostomyAntigens, BacterialOrganometallic CompoundsEndoscopy, Digestive SystemPenicillinsPepsinogen CRecurrenceFamotidineDuodenal DiseasesRabeprazoleGastrointestinal DiseasesSucralfateSecretory RateSulfoxidesPrevalenceAnti-Inflammatory Agents, Non-SteroidalParietal Cells, GastricPepsin ACysteamineBuruli UlcerProspective StudiesTetracyclineGastroesophageal RefluxZollinger-Ellison SyndromeImmunoglobulin GGastrointestinal HemorrhageAchlorhydriaBenzimidazolesAntitrichomonal AgentsGerbillinaeEsophagitis, PepticSeroepidemiologic StudiesRisk FactorsEsophagitisChronic DiseaseEnzyme-Linked Immunosorbent AssayLewis Blood-Group SystemGefarnateTreatment OutcomeTime FactorsGastrectomy