Open access peer-reviewed chapter
By Lizbeth González-Herrera, Orlando Vargas-Sierra, Silvina Contreras-Capetillo, Gerardo Pérez-Mendoza, Ileana Castillo-Zapata, Doris Pinto-Escalante, Thelma Canto de Cetina and Betzabet Quintanilla-Vega
Submitted: March 29th 2011Reviewed: October 14th 2011Published: March 16th 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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