Helicobacter pyloriGastritisHelicobacter InfectionsGastric MucosaGastritis, AtrophicStomach NeoplasmsPyloric AntrumStomachGastroscopyUreasePeptic UlcerMetaplasiaPepsinogen AGastritis, HypertrophicDuodenal UlcerDyspepsiaStomach UlcerStomach DiseasesAchlorhydriaAmoxicillinPylorusAnti-Ulcer AgentsGastrinsClarithromycinOmeprazolePepsinogen CMetronidazoleDuodenitisBile RefluxBacterial ProteinsBiopsyHelicobacterParietal Cells, GastricHelicobacter felisPepsinogensHelicobacter heilmanniiChronic DiseaseBismuthAntibodies, BacterialEndoscopy, GastrointestinalGastric JuiceCampylobacterAnemia, PerniciousBreath TestsGastric AcidAnti-Bacterial AgentsPrecancerous ConditionsLansoprazoleEndoscopyPostgastrectomy SyndromesProton Pump InhibitorsDrug Therapy, CombinationGerbillinae