| http://www.w3.org/ns/prov#value | - When procedures are performed in cavities such as the abdomen and thorax, conventional retractors or other tissue manipulators can normally be used for exposure of tissue to be treated; however, where the tissue to be treated is located in obstructed anatomical sites such as in very small cavities, in potential cavities such as between layers of anatomical walls, in non-layered or homogeneous tiss
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