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One group has a Method (attribute) of Puncture - action (qualifier value) and a Procedure site - Direct (attribute) of the structure being punctured.

For example,

• • • 91602002 |Thoracentesis (procedure)| has Procedure site - Direct (attribute) of Pleural membrane structure (body structure)

The A second group has a Method (attribute) of Aspiration - action (qualifier value) and a Procedure site - Indirect (attribute) of the space being aspirated.

For example,

• • 91602002 |Thoracentesis (procedure)|

...

• • has:
    • Role group 1:
      • Method = Puncture - action
      • Procedure site - Direct (attribute) = Pleural membrane structure (body structure)
      • Using device = Needle, device
    • Role group 2:
      • Method = Aspiration - action
      • Procedure site - Indirect (attribute)

...

• • • • = Pleural cavity structure (body structure)
      • Using device = Needle, device