RT Journal Article SR Electronic T1 Evidence based and guideline based medicine JF Journal of Accident & Emergency Medicine JO Arch Emerg Med FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 154 OP 155 DO 10.1136/emj.17.2.154-c VO 17 IS 2 A1 Thomas Carrigan YR 2000 UL http://emj.bmj.com/content/17/2/154.4.abstract AB