Open access peer-reviewed chapter
By Nora Elizondo, Paulina Segovia, Víctor Coello, Jesús Arriaga, Sergio Belmares, Aracelia Alcorta, Francisco Hernández, Ricardo Obregón, Ernesto Torres and Francisco Paraguay
Submitted: May 1st 2011Reviewed: November 24th 2011Published: March 23rd 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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