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Gastrointestinal DiseasesDyspepsiaIrritable Bowel SyndromeDiarrheaFlatulenceColonic Diseases, FunctionalAbdominal PainGastrointestinal TractEndoscopy, GastrointestinalCeliac DiseaseGastrointestinal AgentsFecesGastroenterologyHelicobacter InfectionsGastroenteritisUpper Gastrointestinal TractHelicobacter pyloriGastroesophageal RefluxEnterocolitis, NecrotizingEnteritisGastroparesisPeptic UlcerConstipationProbioticsClostridium perfringensGastrointestinal MotilityIntestinal DiseasesGastritisInflammatory Bowel DiseasesLactose IntoleranceCrohn DiseaseSan MarinoStomach DiseasesNauseaGastric EmptyingQuestionnairesDigestive SystemEnterocolitisPrevalenceBlastocystisFoodborne DiseasesFood HypersensitivityPelvic NeoplasmsStomachBlastocystis InfectionsIntestinal MucosaVomitingGiardiasisHeartburnCalculiDuodenal UlcerDuodenumRadioallergosorbent TestGastric MucosaColitis, UlcerativeClostridium InfectionsBiopsyTreatment OutcomeLactose Tolerance TestEosinophiliaIntestinesProspective StudiesExocrine Pancreatic InsufficiencyCampylobacter InfectionsRetrospective StudiesDientamoebiasisEndoscopy, Digestive SystemGastrointestinal NeoplasmsIntubation, GastrointestinalEndoscopyRisk FactorsDientamoebaCase-Control StudiesDuodenal DiseasesPropanthelineDisease OutbreaksRibosome Subunits, SmallBlastocystis hominisMotilinSensitivity and SpecificityStomach NeoplasmsMilk HypersensitivityStomach UlcerDeglutition DisordersPancreatic DiseasesLaryngopharyngeal RefluxSeverity of Illness IndexChronic DiseaseJejunumBreath TestsGlutensIntestine, SmallCampylobacter jejuniGastric JuiceIncidenceQuality of LifeTime FactorsDiet, Gluten-FreeCiguatera PoisoningColon