Open access peer-reviewed chapter
By Maria do Carmo Rangel, Ana Paula de Melo Monteiro, Marcelo Oportus, Patricio Reyes, Márcia de Souza Ramos and Sirlene Barbosa Lima
Submitted: April 18th 2011Reviewed: October 11th 2011Published: March 9th 2012
DOI: 10.5772/33255
Downloaded: 4115
© 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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