Gastritis, AtrophicGastritisPepsinogen APepsinogen CGastric MucosaHelicobacter pyloriHelicobacter InfectionsStomach NeoplasmsMetaplasiaGastroscopyMoxibustionGastrinsPepsinogensStomachCorydalisEnterochromaffin-like CellsAtractylodesPrecancerous ConditionsParietal Cells, GastricAchlorhydriaChronic DiseaseCarcinoid TumorAnemia, PerniciousChromogranin APyloric AntrumBiopsyGastric JuiceIntrinsic FactorStomach DiseasesPostgastrectomy SyndromesStomach UlcerAtrophyRisk FactorsGastric AcidPeptic UlcerGastritis, HypertrophicEndoscopy, GastrointestinalAnti-Ulcer AgentsDuodenal UlcerEndoscopyUreaseVitamin B 12Malabsorption SyndromesDyspepsiaOmeprazole