Affiliation: | G. M. M. Thoms, MB. ChB, DCH. FFARCS, Senior Registrar in Anaesthetics, Sheffield AHA(T), I.J. Reece. MB, FRCS, Cardiothoracic Registrar, Royal Hallamshire Hospital, Sheffield, N. J. Odom, MB, FRCS, Cardiothoracic Registrar, Northern General Hospital, Sheffield, CM. Kaye, BSc. PhD. CChem, MRSC. M.G. Sankey, BSc. Clinical Assay Unit, May &Baker Ltd. |