RT Journal Article SR Electronic T1 The clinical practice of emergency medicine, 3rd edn JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 110 OP 110 DO 10.1136/emj.20.1.110 VO 20 IS 1 A1 D Pedley YR 2003 UL http://emj.bmj.com/content/20/1/110.1.abstract AB