SteatorrheaMalabsorption SyndromesCeliac DiseaseExocrine Pancreatic InsufficiencyPancrelipaseIntestinal AbsorptionLactose IntolerancePancreatic Function TestsPancreatitis, ChronicJejunumSprue, TropicalFecesBile Acids and SaltsPancreatitisLactose Tolerance TestSchilling TestIntrinsic FactorPancreasBreath TestsLipid MetabolismXyloseVitamin B 12Proton-Coupled Folate TransporterChromatography, Thin LayerHydrogenFructose IntoleranceCobalt IsotopesLactulose