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Open access peer-reviewed chapter
By Fabiana C.P. Valera, Edwin Tamashiro and Wilma T. Anselmo-Lima
Submitted: December 14th 2011Reviewed: September 6th 2012Published: November 28th 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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