Open access peer-reviewed chapter
By Miliane Moreira Soares de Souza, Shana de Mattos de Oliveira Coelho, Ingrid Annes Pereira, Lidiane de Castro Soares, Bruno Rocha Pribul and Irene da Silva Coelho
Submitted: February 28th 2011Reviewed: September 20th 2011Published: April 4th 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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