Department of Anesthesiology and Department of Pediatric Surgery, Hôtel-Dieu, Clermont-Ferrand, France. Address correspondence to Dr. Dalens, Pavillon Gosselin, Hôtel-Dieu, B.P. 69, 63003 Clermont-Ferrand, France. Accepted for publication May 8, 1986.
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Dalens et al. (1986) studied this question.