Department of Orthopaedic Surgery, Indiana University School of Medicine, Indianapolis, and Indianapolis Neurosurgical Group, Indianapolis, Indiana, U.S.A. Received November 6, 2000; accepted February 1, 2001. Address correspondence and reprint requests to Dr. R. C. Sasso, Indianapolis Neurosurgical Group, 8402 Harcourt Rd., Suite 500, Indianapolis, IN 46260, U.S.A.
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