Open access peer-reviewed chapter
By Madalena Vieira-Pinto, Patricia Themudo, Lucas Dominguez, Jose Francisco Fernandez-Garayzabal, Ana Isabel Vela, Fernando Bernardo, Cristina Lobo Vilela and Manuela Oliveira
Submitted: March 16th 2011Reviewed: October 31st 2011Published: July 18th 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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