. 2011 Jun 13;12:233. doi: 10.1186/1471-2105-12-233
Copyright ©2011 Fu 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.