RT Journal Article SR Electronic T1 True posterior myocardial infarction: the importance of leads V7–V9 JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 456 OP 457 DO 10.1136/emj.2008.069195 VO 26 IS 6 A1 J Lindridge YR 2009 UL http://emj.bmj.com/content/26/6/456.abstract AB