Affiliation: | J. Groves, FRCA, Registrar, Department of Anaesthetics, Northern General Hospital, Herries Road, Sheffield S5 7AU, N. Edwards, FRCA, Lecturer, Department of Surgical and Anaesthetic Sciences, University of Sheffield, Royal Hallamshire Hospital, Sheffield S10 2JF, B. Carr, FRCA, Registrar, Department of Anaesthetics, Northern General Hospital, Herries Road, Sheffield S5 7AU. |