HelicobacterGastritisHelicobacter pyloriHelicobacter InfectionsHelicobacter felisUreaseGastric MucosaStomachGastritis, AtrophicPyloric AntrumHelicobacter heilmanniiHelicobacter hepaticusStomach NeoplasmsPeptic UlcerGastroscopyMetaplasiaDyspepsiaPepsinogen AStomach DiseasesStomach UlcerAmoxicillinGastritis, HypertrophicClarithromycinAnti-Ulcer AgentsMetronidazoleOmeprazoleBacterial ProteinsAntigens, BacterialAchlorhydriaGastrinsBismuthPepsinogen CDuodenitisBiopsyAntibodies, BacterialBile RefluxParietal Cells, Gastric2-PyridinylmethylsulfinylbenzimidazolesEndoscopy, GastrointestinalBreath TestsPepsinogensChronic DiseaseAnti-Bacterial AgentsLansoprazoleGastric JuiceProton Pump InhibitorsGastric AcidDNA, BacterialDrug Therapy, CombinationCampylobacterDuodenal UlcerPolymerase Chain ReactionPrecancerous ConditionsGerbillinaeAnemia, PerniciousLewis Blood-Group SystemTinidazoleEndoscopyAcinonyxLymphoma, B-Cell, Marginal ZoneEndoscopy, Digestive SystemAntacidsRanitidineCytotoxinsUreaPostgastrectomy SyndromesMolecular Sequence DataAtrophyGastric Acidity DeterminationGastrointestinal DiseasesImmunoglobulin GGastric MucinsH(+)-K(+)-Exchanging ATPaseGastroesophageal RefluxGastric FundusRNA, Ribosomal, 16SRabeprazoleEsophagitisFurazolidoneEnzyme-Linked Immunosorbent Assay