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 E02 Therapeutics D013812 +
  E02.095 Biological Therapy D001691 +
   E02.095.125 Blood Patch, Epidural D017217 

 E05 Investigative Techniques D008919 +
  E05.300 Drug Administration Routes D004333 +
   E05.300.530 Injections D007267 +
    E05.300.530.580 Injections, Spinal D007278 +
     E05.300.530.580.300 Injections, Epidural D007268 +
      E05.300.530.580.300.145 Blood Patch, Epidural D017217