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From the *Spine Unit, Schulthess Hospital, Zürich, Switzerland, and the †Department of Anesthesiology, Dartmouth–Hitchcock Medical Center, Lebanon, New Hampshire. Address reprint requests to A. Benini, MD Neurosurgical Department, Spine Unit Schulthess Hospital Lengghalde 2 CH-8008 Zürich Switzerland E-mail:[email protected]
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Benini et al. (1999) studied this question.
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