GlutensCeliac DiseaseHLA-DR5 AntigenGliadinDiet, Gluten-FreeTransglutaminasesLactose IntoleranceGlucose IntoleranceDermatitis HerpetiformisReticulinJejunumDuodenumImmunoglobulin AIntestinal MucosaFructose IntoleranceHLA-DQ AntigensOrthostatic IntoleranceIntestine, SmallProlaminsBiopsyAvena sativaAutoantibodiesWheat HypersensitivityTriticumDiet TherapyMalabsorption SyndromesFood HypersensitivityInterleukin-18 Receptor beta SubunitAtrophyDiet, Protein-RestrictedHLA-DR3 AntigenAntibodiesGlucose Tolerance TestLactuloseImmunoglobulin GFlourPrevalenceBread