George Papanicolau Hospital (KSP) and Department of Neurosurgery, Aristotelian University of Thessaloniki, AHEPA Hospital (AK), Thessaloniki, Macedonia, Greece Reprint requests: Konstantinos S. Polyzoidis, M.D., 60 Tsimiski Street, Thessaloniki 54622, Greece. Received, May 2, 1994. Accepted, June 2, 1994.
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Polyzoidis et al. (1994) studied this question.