RT Journal Article SR Electronic T1 Critical appraisal for emergency medicine: 5 Evaluation of a diagnostic test JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 53 OP 56 DO 10.1136/emj.2007.057349 VO 26 IS 1 A1 S Goodacre YR 2009 UL http://emj.bmj.com/content/26/1/53.abstract AB