1. D.A. Browne, FFARCSI, Department of Anaesthetics, Royal Postgraduate Medical School, Hammersmith Hospital, Du Cane Road, London W12 OHS.
2. R. de Boeck, MD, Registrars, Department of Anaesthetics, Royal Postgraduate Medical School, Hammersmith Hospital, Du Cane Road, London W12 OHS.
3. M. Morgan, FFARCS, Reader in Anaesthetic Practice, Department of Anaesthetics, Royal Postgraduate Medical School, Hammersmith Hospital, Du Cane Road, London W12 OHS.