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 C06 Digestive System Diseases D004066 +
  C06.405 Gastrointestinal Diseases D005767 +
   C06.405.469 Intestinal Diseases D007410 +
    C06.405.469.637 Malabsorption Syndromes D008286 +
     C06.405.469.637.506 Lactose Intolerance D007787 

 C16 Congenital, Hereditary, and Neonatal Diseases and Abnormalities D009358 +
  C16.320 Genetic Diseases, Inborn D030342 +
   C16.320.565 Metabolism, Inborn Errors D008661 +
    C16.320.565.202 Carbohydrate Metabolism, Inborn Errors D002239 +
     C16.320.565.202.589 Lactose Intolerance D007787 

 C18 Nutritional and Metabolic Diseases D009750 +
  C18.452 Metabolic Diseases D008659 +
   C18.452.603 Malabsorption Syndromes D008286 +
    C18.452.603.506 Lactose Intolerance D007787 

 C18 Nutritional and Metabolic Diseases D009750 +
  C18.452 Metabolic Diseases D008659 +
   C18.452.648 Metabolism, Inborn Errors D008661 +
    C18.452.648.202 Carbohydrate Metabolism, Inborn Errors D002239 +
     C18.452.648.202.589 Lactose Intolerance D007787