Open access peer-reviewed chapter
By Susana Coimbra, Hugo Oliveira, Américo Figueiredo, Petronila Rocha-Pereira and Alice Santos-Silva
Submitted: February 8th 2011Reviewed: July 6th 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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