Morris Paul David, Saraf Karan, Sahu Jonathan, Sheridan Paul
Medical Physics Group, Dept of Cardiovascular Science, School of Medicine, University of Sheffield, Beech Hill Rd, Sheffield S10 2RX, UK.
Emerg Med J. 2012 Dec;29(12):998-9. doi: 10.1136/emermed-2012-201251. Epub 2012 Apr 13.