RT Journal Article SR Electronic T1 Critical appraisal for emergency medicine: 1. Concepts and definitions JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 219 OP 221 DO 10.1136/emj.2007.057307 VO 25 IS 4 A1 S Goodacre YR 2008 UL http://emj.bmj.com/content/25/4/219.abstract AB