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 C10 Nervous System Diseases D009422 +
  C10.597 Neurologic Manifestations D009461 +
   C10.597.606 Neurobehavioral Manifestations D019954 +
    C10.597.606.643 Mental Retardation D008607 +
     C10.597.606.643.970 Williams Syndrome D018980 

 C14 Cardiovascular Diseases D002318 +
  C14.280 Heart Diseases D006331 +
   C14.280.484 Heart Valve Diseases D006349 +
    C14.280.484.150 Aortic Valve Stenosis D001024 +
     C14.280.484.150.060 Aortic Stenosis, Supravalvular D021921 +
      C14.280.484.150.060.960 Williams Syndrome D018980 

 C16 Congenital, Hereditary, and Neonatal Diseases and Abnormalities D009358 +
  C16.131 Abnormalities D000013 +
   C16.131.260 Chromosome Disorders D025063 +
    C16.131.260.970 Williams Syndrome D018980 

 C16 Congenital, Hereditary, and Neonatal Diseases and Abnormalities D009358 +
  C16.320 Genetic Diseases, Inborn D030342 +
   C16.320.180 Chromosome Disorders D025063 +
    C16.320.180.970 Williams Syndrome D018980