Open access peer-reviewed chapter
By Li-Jun Xue, Quan-Sheng Su, Xiao-Bei Mao, Xiao-Bei Liu, Qing Lin, Chang Liu, Yong Lin, Ji-Hong Yang, Hong-Ju Yu and Xiao-Yuan Chu
Submitted: October 14th 2010Reviewed: April 22nd 2011Published: June 15th 2011
© 2011 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike-3.0 License, which permits use, distribution and reproduction for non-commercial purposes, provided the original is properly cited and derivative works building on this content are distributed under the same license.
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