Helicobacter pyloriGastritisHelicobacter InfectionsHelicobacterGastritis, AtrophicBiopsyGastric MucosaUreaseStomachPyloric AntrumPeptic UlcerStomach NeoplasmsDyspepsiaGastroscopyHelicobacter heilmanniiAmoxicillinClarithromycinStomach DiseasesMetronidazoleMetaplasiaHelicobacter hepaticusAnti-Ulcer AgentsStomach UlcerOmeprazoleBacterial ProteinsBiopsy, NeedlePepsinogen AGastritis, HypertrophicBismuthAntibodies, BacterialDuodenal UlcerGastrinsDuodenitisAchlorhydriaBreath TestsAntigens, BacterialPepsinogen CAnti-Bacterial AgentsEndoscopy, GastrointestinalLansoprazolePylorusPepsinogensProton Pump InhibitorsParietal Cells, GastricDrug Therapy, CombinationChronic DiseaseGastric JuiceGastric AcidPolymerase Chain ReactionBile RefluxDNA, BacterialCampylobacterGerbillinaeLewis Blood-Group SystemTinidazole2-PyridinylmethylsulfinylbenzimidazolesPrecancerous ConditionsEndoscopyRanitidineEndoscopy, Digestive SystemLymphoma, B-Cell, Marginal ZoneUreaAntacidsHelicobacter felisCytotoxinsMolecular Sequence DataImmunoglobulin GFurazolidoneGastrointestinal DiseasesAnemia, PerniciousSensitivity and SpecificityGastric MucinsGastroesophageal RefluxGastric Acidity DeterminationAtrophyDuodenumAcinonyxEsophagitisEnzyme-Linked Immunosorbent AssayPrevalenceOrganometallic CompoundsTetracyclineAntitrichomonal AgentsGastric FundusVirulencePenicillinsBacterial AdhesionVirulence FactorsProspective StudiesGenes, BacterialEsophagitis, PepticInterleukin-8Postgastrectomy SyndromesAzure StainsH(+)-K(+)-Exchanging ATPaseRNA, Ribosomal, 16SEpithelial CellsImmunohistochemistryCampylobacter InfectionsPeptic Ulcer Hemorrhage