GastritisSepsisGastritis, AtrophicHelicobacter pyloriGastric MucosaHelicobacter InfectionsMetaplasiaChronic DiseaseStomach NeoplasmsPyloric AntrumStomach UlcerStomachPeptic UlcerPepsinogen AAchlorhydriaGastroscopyDyspepsiaDuodenitisDuodenal UlcerBiopsyPepsinogen CStomach DiseasesGastrinsHelicobacter heilmanniiBile RefluxHelicobacterGastric JuiceUreaseCampylobacterAtrophyHelicobacter felisPrecancerous ConditionsAntigens, BacterialEndoscopy, GastrointestinalGastritis, HypertrophicBacterial ProteinsLymphoma, B-Cell, Marginal ZoneAmoxicillinAnti-Ulcer AgentsCampylobacter InfectionsAntibodies, BacterialOmeprazoleClarithromycinLewis Blood-Group SystemCytotoxinsPolymerase Chain ReactionGenotypeDuodenumImmunohistochemistryIntestinesAnti-Bacterial AgentsAdenocarcinomaParietal Cells, GastricAnemia, PerniciousGene Rearrangement, B-Lymphocyte, Heavy ChainMexicoDNA, BacterialImmunoglobulin GShock, SepticPepsinogensImmunoglobulin APostgastrectomy SyndromesCase-Control StudiesHyperplasiaInterleukin-1betaProspective StudiesRisk FactorsPrevalencePolymorphism, GeneticSeverity of Illness IndexRetrospective StudiesDrug Therapy, CombinationEnzyme-Linked Immunosorbent AssayEndoscopyAcinonyx