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From the *University of Pittsburgh School of Medicine, Department of Orthopaedic Surgery, Pittsburgh, PA; and the **Department of Orthopaedic Surgery, Emory Clinic Spine Center, Decatur, GA. Reprint requests to James D. Kang, MD, University of Pittsburgh School of Medicine, Department of Orthopaedic Surgery, 3471 Fifth Avenue, Suite 1010, Pittsburgh, PA 15213.
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Kang et al. (2000) studied this question.
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