. 2009 Jul 15;13(4):R118. doi: 10.1186/cc7968
Copyright ©2009 Luo et al.; licensee BioMed Central Ltd.
This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.