Open access peer-reviewed chapter
By Chiung-Ru Lai, Chih-Yi Hsu and Anna Fen-Yau Li
Submitted: April 6th 2011Reviewed: September 9th 2011Published: February 8th 2012
DOI: 10.5772/31971
Downloaded: 10529
© 2012 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution 3.0 License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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