All

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 C18 Nutritional and Metabolic Diseases D009750 +
  C18.654 Nutrition Disorders D009748 +
   C18.654.521 Malnutrition D044342 +
    C18.654.521.500 Deficiency Diseases D003677 +
     C18.654.521.500.133 Avitaminosis D001361 +
      C18.654.521.500.133.699 Vitamin B Deficiency D014804 +
       C18.654.521.500.133.699.923 Vitamin B 12 Deficiency D014806 +
         C18.654.521.500.133.699.923.280 Anemia, Pernicious D000752