GastritisGastritis, AtrophicHelicobacter pyloriGastric MucosaHelicobacter InfectionsInflammatory Bowel DiseasesPyloric AntrumIrritable Bowel SyndromeGastritis, HypertrophicStomachMetaplasiaGastroscopyPepsinogen AStomach NeoplasmsAchlorhydriaBile RefluxStomach UlcerGastrinsShort Bowel SyndromePeptic UlcerPepsinogen CStomach DiseasesDuodenal UlcerCrohn DiseaseHelicobacter felisChronic DiseaseHelicobacter heilmanniiDuodenitisBiopsyParietal Cells, GastricAnemia, PerniciousDyspepsiaHelicobacterEndoscopy, GastrointestinalOrgan TransplantationColitis, UlcerativeTissue and Organ ProcurementGastric JuiceUreasePepsinogensPostgastrectomy SyndromesPrecancerous ConditionsIntestinal MucosaEndoscopyIntestinesCampylobacterAtrophyAcinonyxIntestinal DiseasesAnti-Ulcer AgentsAntigens, BacterialMultiple Organ FailureAutoimmune DiseasesGastric AcidGastrointestinal DiseasesColonH(+)-K(+)-Exchanging ATPaseOrgan SizeAmoxicillinEndoscopy, Digestive SystemConstipationOmeprazoleDefecationAntibodies, BacterialDuodenogastric RefluxOrgan of CortiGastroenterostomyGastric FundusOrgan SpecificityAbdominal PainIntestine, LargeDuodenumIntrinsic FactorColitisThymectomyBacterial ProteinsGastric Acidity DeterminationBismuthIntestinal NeoplasmsImmunohistochemistryGastrointestinal HemorrhageCampylobacter InfectionsNeurogenic BowelEsophagitisMice, Inbred C57BLGastrointestinal MotilityBarium SulfateAntacidsLymphocytosisGastrointestinal AgentsColonic DiseasesGastroesophageal RefluxGastrointestinal TransitProspective StudiesDuodenal DiseasesDisease Models, AnimalMalabsorption SyndromesPolymerase Chain ReactionGastrin-Secreting CellsRetrospective Studies