Open access peer-reviewed chapter
By Beatriz Sánchez-Espiridión, Juan F. García and Margarita Sánchez-Beato
Submitted: March 28th 2011Reviewed: September 20th 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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