aNinewells Hospital and Medical School, Dundee, Scotland UK bDepartment of Epidemiology and Public Health, University of Dundee, Dundee, Scotland UK ∗Correspondence to: Dr. W.A. Macrae, Department of Anaesthetics, Ninewells Hospital and Medical School, Dundee, DD1 9SY, Scotland UK, Tel.: (0382) 60111. (Received and accepted 20 December 1991.)
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Macrae et al. (1992) studied this question.
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