| http://www.w3.org/ns/prov#value | - Open approach was offered in the following circumstances: large tumors that required multiple ablations even with the cluster electrode; tumors located near the dome of the liver, for which percutaneous ablation might cause pneumothorax or damage to the diaphragm; or tumors that were located near visceral organs such as the gallbladder, colon, or stomach.
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