GastritisGefarnateMetaplasiaStomach UlcerGastritis, AtrophicGastrointestinal HemorrhageInflammationHelicobacter pyloriGastric MucosaHelicobacter InfectionsPyloric AntrumGastritis, HypertrophicInflammation MediatorsStomachGastroscopyPepsinogen AStomach NeoplasmsAchlorhydriaBile RefluxChronic DiseaseGastrinsPeptic UlcerPepsinogen CStomach DiseasesMice, Inbred C57BLHelicobacter felisDuodenal UlcerDisease Models, AnimalBiopsyDuodenitisHelicobacter heilmanniiParietal Cells, GastricAnemia, PerniciousCytokinesHelicobacterDyspepsiaUreaseGastric JuicePepsinogensMice, KnockoutPostgastrectomy SyndromesPrecancerous ConditionsEndoscopy, GastrointestinalAutoimmune DiseasesBiological MarkersPneumoniaAtrophyTumor Necrosis Factor-alphaLungNeutrophils