Open access peer-reviewed chapter
By Jack Appiah Ofori and Yun-Hwa Peggy Hsieh
Submitted: April 9th 2011Reviewed: October 30th 2011Published: February 22nd 2012
© 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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