. 2014 Mar 18;18(2):212. doi: 10.1186/cc13779
Copyright © 2014 Kida and Ichinose licensee Springer-Verlag Berlin Heidelberg and BioMed Central
This article is one of ten reviews selected from the Annual Update in Intensive Care and Emergency Medicine 2014 and co-published as a series in Critical Care. Other articles in the series can be found online at http://ccforum.com/series/annualupdate2014. Further information about the Annual Update in Intensive Care and Emergency Medicine is available from http://www.springer.com/series/8901.