RT Journal Article SR Electronic T1 Authors’ response JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 246 OP 247 VO 25 IS 4 A1 L Cascarini A1 A Kumar YR 2008 UL http://emj.bmj.com/content/25/4/246.4.abstract AB