1. C.F. Stannard, MB, ChB, FCAnaes, Registrar, Oxford Regional Pain Relief Unit, Abingdon Hospital, Marcham Road, Abingdon, Oxon, and Nuffield Department of Anaesthetics, John Radcliffe Hospital, Headington, Oxford.
2. C.J. Glynn, MB, BS, MSc, DCH, FFARCS, Consultant, Oxford Regional Pain Relief Unit, Abingdon Hospital, Marcham Road, Abingdon, Oxon, and Nuffield Department of Anaesthetics, John Radcliffe Hospital, Headington, Oxford.
3. S.P. Smith,* BSc, MB, ChB, FFARCS, MRCP, Senior Registrar, Oxford Regional Pain Relief Unit, Abingdon Hospital, Marcham Road, Abingdon, Oxon, and Nuffield Department of Anaesthetics, John Radcliffe Hospital, Headington, Oxford.