Open access peer-reviewed chapter
By Carolina Sousa, Ana Real, Mª De Lourdes Moreno and Isabel Comino
Submitted: March 15th 2011Reviewed: May 7th 2012Published: July 19th 2012
DOI: 10.5772/47909
Downloaded: 1518
© 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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