RT Journal Article SR Electronic T1 Journal scan JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 68 OP 69 DO 10.1136/emj.20.1.68 VO 20 IS 1 A1 J P Wyatt A1 L Woolrich-Burt YR 2003 UL http://emj.bmj.com/content/20/1/68.abstract AB