RanitidineOrganometallic CompoundsAntacidsAnti-Ulcer AgentsMetronidazoleSalicylatesAmoxicillinHelicobacter pyloriHelicobacter InfectionsClarithromycinHistamine H2 AntagonistsColonic NeoplasmsFurazolidoneDimercaprolTinidazoleDuodenal UlcerDrug Therapy, CombinationTetracyclineColon, DescendingOmeprazoleGermaniumKlatskin's TumorAnti-Bacterial AgentsSucralfatePeptic UlcerDyspepsiaPenicillinsColon, SigmoidRadiation ProtectionHydrocarbons, IodinatedAntimonyGastric MucinsColon, AscendingProton Pump InhibitorsThymolphthaleinHepatic Duct, CommonColloidsScintillation CountingAntidiarrhealsBreath TestsGastritisBiliary Tract Surgical ProceduresCimetidine2-PyridinylmethylsulfinylbenzimidazolesGastric MucosaBile Ducts, IntrahepaticAlpha ParticlesGastroscopyColon, TransverseTooth DiscolorationResins, SyntheticIntestinal MucosaBile Duct NeoplasmsAntitrichomonal AgentsErythromycin EthylsuccinateStomach UlcerSulfoxidesSpectrophotometry, AtomicElectrodesMyoclonusDrug CombinationsProsthesis ColoringCampylobacterLansoprazoleSilicatesTreatment OutcomeDuodenumHT29 CellsCampylobacter InfectionsMetals, HeavyIndiumAzoxymethaneDiverticulum, ColonNitroimidazolesCholangiocarcinomaRadiation-Protective AgentsSalmonellaStomach DiseasesLevofloxacinAminosalicylic AcidsBile DuctsUreaseAnti-Infective AgentsDouble-Blind MethodColonic DiseasesTime FactorsDental CementsDrug Resistance, MicrobialMetallothioneinUreaMetalsAnti-Infective Agents, LocalGastrinsDrug Administration ScheduleRadioisotopesGlycocalyxProspective StudiesOfloxacinMicrobial Sensitivity TestsDigestive System