DyspepsiaGastritisGastritis, AtrophicHelicobacter pyloriGastric MucosaHelicobacter InfectionsInflammatory Bowel DiseasesPyloric AntrumIrritable Bowel SyndromeGastritis, HypertrophicMetaplasiaStomachGastroscopyPepsinogen AStomach NeoplasmsAchlorhydriaBile RefluxStomach UlcerGastrinsShort Bowel SyndromePeptic UlcerPepsinogen CStomach DiseasesDuodenal UlcerCrohn DiseaseHelicobacter felisHelicobacter heilmanniiDuodenitisParietal Cells, GastricChronic DiseaseAnemia, PerniciousBiopsyHelicobacterEndoscopy, GastrointestinalColitis, UlcerativeGastric JuiceUreasePepsinogensPostgastrectomy SyndromesPrecancerous ConditionsCampylobacterEndoscopyAtrophyIntestinal MucosaAcinonyxAnti-Ulcer Agents