Helicobacter pyloriHelicobacter InfectionsGastritisGastric MucosaUreasePylorusPeptic UlcerStomachClarithromycinMetronidazoleAmoxicillinDyspepsiaDuodenal UlcerBacterial ProteinsAnti-Ulcer AgentsOmeprazoleStomach NeoplasmsPyloric AntrumStomach DiseasesGastritis, AtrophicBreath TestsStomach UlcerAntibodies, BacterialBismuthAnti-Bacterial AgentsGastroscopy