All

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 C10 Nervous System Diseases D009422 +
  C10.228 Central Nervous System Diseases D002493 +
   C10.228.140 Brain Diseases D001927 +
    C10.228.140.300 Cerebrovascular Disorders D002561 +
     C10.228.140.300.800 Vascular Headaches D014653 +
      C10.228.140.300.800.771 Tension Headache D018781 
 C10 Nervous System Diseases D009422 +
  C10.228 Central Nervous System Diseases D002493 +
   C10.228.140 Brain Diseases D001927 +
    C10.228.140.546 Headache Disorders D020773 +
     C10.228.140.546.800 Vascular Headaches D014653 +
      C10.228.140.546.800.800 Tension Headache D018781 
 C14 Cardiovascular Diseases D002318 +
  C14.907 Vascular Diseases D014652 +
   C14.907.253 Cerebrovascular Disorders D002561 +
    C14.907.253.937 Vascular Headaches D014653 +
     C14.907.253.937.771 Tension Headache D018781