Open access peer-reviewed chapter
By Roseli Tuan, Fernanda Pires Ohlweiler, Raquel Gardini Sanches Palasio, Ricardo Dalla Zanna and Marisa Cristina De Almeida Guimarães
Submitted: January 27th 2011Reviewed: July 8th 2011Published: January 13th 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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