Lactose IntoleranceLactaseLactose Tolerance TestLactoseFlatulenceDairy ProductsBreath TestsLactase-Phlorizin HydrolaseHydrogenMilkKwashiorkorMalabsorption SyndromesAbdominal PainCalcium, DietaryNational Institute of Mental Health (U.S.)Glucose IntoleranceLactose SynthaseSensitivity and SpecificityDiarrheaIntestine, SmallIrritable Bowel SyndromeFructose Intolerancebeta-GalactosidaseLactose Factors