Peptic UlcerDuodenal UlcerPeptic Ulcer HemorrhageStomach UlcerPeptic Ulcer PerforationHelicobacter pyloriHelicobacter InfectionsDyspepsiaGastritisAnti-Ulcer AgentsGastric MucosaGastroscopyOmeprazoleProton Pump InhibitorsEndoscopy, GastrointestinalAmoxicillinSkin UlcerFurazolidoneMetronidazoleHemostasis, EndoscopicUlcerHematemesisClarithromycinStomach DiseasesDuodenitisAntacidsBismuthHistamine H2 AntagonistsStomachLeg UlcerGastric Outlet ObstructionEndoscopy, Digestive SystemBuruli UlcerLansoprazolePressure UlcerGastric AcidAnti-Inflammatory Agents, Non-SteroidalGastrointestinal DiseasesPyloric AntrumCimetidineMelenaGastric FistulaGastrointestinal HemorrhageEsophagitisDrug Therapy, CombinationGastric JuiceStomach NeoplasmsUrease2-PyridinylmethylsulfinylbenzimidazolesEndoscopyRanitidineGastrectomyAntigens, BacterialHaemophilus ducreyiGastroenterostomyUpper Gastrointestinal TractAnti-Bacterial AgentsMycobacterium ulceransPeriprosthetic FracturesVagotomyDuodenumGenital Diseases, MaleTinidazoleBacterial ProteinsRecurrenceGastrinsBreath TestsAntitrichomonal AgentsCytotoxinsOrganometallic CompoundsTetracyclineRisk FactorsPrevalenceVagotomy, Proximal GastricDuodenoscopyGastroesophageal RefluxBiopsyTreatment OutcomeCampylobacterProspective StudiesGenital Diseases, FemaleRabeprazoleAntibodies, BacterialIncidenceVirulencePylorusZollinger-Ellison SyndromeCalymmatobacteriumPolymerase Chain ReactionAspirinRetrospective StudiesAge FactorsHong KongTime FactorsMycobacterium Infections, NontuberculousAge DistributionPepsinogensFollow-Up StudiesElectrocoagulationSmoking