NA;Using the Greenberg universal retraction system, a single surgeon can control four or more microinstruments simultaneously in a single microsurgical field. By decreasing the number of hand movements heretofore required and by increasing the surgeon's biotechnological options, the entire microsurgical procedure becomes more efficient and more economical. maximizing the surgeon's capabilities and performance. lpar;Neurosurgery9colon;566 572. 1981rpar;
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