All

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 C17 Skin and Connective Tissue Diseases D017437 +
  C17.800 Skin Diseases D012871 +
   C17.800.849 Skin Diseases, Metabolic D012875 +
    C17.800.849.617 Porphyria D011164 +
      C17.800.849.617.250 Porphyria, Erythropoietic D017092 
      C17.800.849.617.400 Porphyria, Hepatic D017094 +
      C17.800.849.617.125 Porphyria, Erythrohepatic D017121 
 C18 Nutritional and Metabolic Diseases D009750 +
  C18.452 Metabolic Diseases D008659 +
   C18.452.872 Skin Diseases, Metabolic D012875 +
    C18.452.872.617 Porphyria D011164 +
      C18.452.872.617.250 Porphyria, Erythropoietic D017092 
      C18.452.872.617.400 Porphyria, Hepatic D017094 +
      C18.452.872.617.125 Porphyria, Erythrohepatic D017121