RT Journal Article SR Electronic T1 Authors’ response: overcautious adoption of extracorporeal cardiopulmonary resuscitation JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP emermed-2017-206917 DO 10.1136/emermed-2017-206917 A1 Clifton W Callway A1 Kjetil Sunde YR 2017 UL http://emj.bmj.com/content/early/2017/07/12/emermed-2017-206917.abstract AB