Affiliation: | S.J. Keens, BSc, MB ChB, FFARCS, Lecturer, M.J. Desmond, MB ChB, MRCP, FFARCS, Registrar, J.E. Utting, MA, MBBChir, FFARCS, Professor, University Department of Anaesthesia, 4th Floor, Royal Liverpool Hospital. Prescot Street, Liverpool, L69 3BX. |