Open access peer-reviewed chapter
By Maria José Curado and Teresa Portela Marques
Submitted: November 28th 2011Reviewed: February 26th 2012Published: June 13th 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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