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aDepartment of Epidemiology and Public Health, University of Dundee, Ninewells Hospital and Medical School, Dundee DD1 9SY, ScotlandUK bDepartment of Anaesthetics, University of Dundee, Ninewells Hospital and Medical School, Dundee DD1 9SY, ScotlandUK ∗Corresponding author: Dr. I.K. Crombie, Department of Epidemiology and Public Health, University of Dundee, Ninewells Hospital and Medical School, Dundee DD1 9SY, ScotlandUK. Tel.: (382) 6011 I. ext. 3155; FAX: (382) 644197. Submitted and accepted December 25, 1993.
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Crombie et al. (1994) studied this question.
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