. 2008 Nov 19;10(6):R136. doi: 10.1186/ar2554
Copyright © 2008 Du 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.