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 C10 Nervous System Diseases D009422 +
  C10.500 Nervous System Malformations D009421 +
   C10.500.680 Neural Tube Defects D009436 +
    C10.500.680.800 Spinal Dysraphism D016135 +
      C10.500.680.800.750 Spina Bifida Occulta D016136 
      C10.500.680.800.730 Spina Bifida Cystica D016137 

 C16 Congenital, Hereditary, and Neonatal Diseases and Abnormalities D009358 +
  C16.131 Abnormalities D000013 +
   C16.131.666 Nervous System Malformations D009421 +
    C16.131.666.680 Neural Tube Defects D009436 +
     C16.131.666.680.800 Spinal Dysraphism D016135 +
       C16.131.666.680.800.750 Spina Bifida Occulta D016136 
       C16.131.666.680.800.730 Spina Bifida Cystica D016137