GastritisGastritis, AtrophicHelicobacter pyloriGastric MucosaHelicobacter InfectionsPyloric AntrumGastritis, HypertrophicMetaplasiaStomachGastroscopyPepsinogen AStomach NeoplasmsAchlorhydriaBile RefluxStomach UlcerChronic DiseaseGastrinsPeptic UlcerPepsinogen CStomach DiseasesDuodenal UlcerDyspepsiaHelicobacter felisBiopsyHelicobacter heilmanniiDuodenitisAnemia, PerniciousParietal Cells, GastricTreatment OutcomeHelicobacterQuestionnairesUreasePostgastrectomy SyndromesRetrospective StudiesEndoscopy, GastrointestinalPepsinogensGastric JuiceEndoscopyFollow-Up StudiesSeverity of Illness IndexPrecancerous ConditionsDepressionProspective StudiesTime FactorsSymptom AssessmentRisk FactorsAtrophyPrevalenceAnti-Ulcer AgentsCampylobacterAcinonyxGastrointestinal DiseasesGastric AcidGastroesophageal RefluxAntigens, BacterialOmeprazoleEndoscopy, Digestive SystemAmoxicillinAutoimmune DiseasesH(+)-K(+)-Exchanging ATPaseDuodenogastric RefluxGastric FundusAntibodies, BacterialGastroenterostomyCross-Sectional StudiesPsychiatric Status Rating ScalesGastric Acidity DeterminationAge FactorsEsophagitisQuality of LifeIntrinsic FactorThymectomyBismuthBacterial ProteinsStress, PsychologicalBehavioral SymptomsAntacidsAnxietyUnited StatesCampylobacter InfectionsPostoperative ComplicationsEsophagitis, PepticSex FactorsLymphocytosisDrug Therapy, CombinationCase-Control StudiesLongitudinal StudiesAdaptation, PsychologicalStress Disorders, Post-TraumaticAffective SymptomsInterviews as TopicDuodenumCohort StudiesProton Pump InhibitorsGastrectomyQualitative ResearchPainJapanDepressive DisorderClarithromycin