Open access peer-reviewed chapter
By Joana Tulha, Joana Carvalho, Rui Armada, Fábio Faria-Oliveira, Cândida Lucas, Célia Pais, Judite Almeida and Célia Ferreira
Submitted: March 30th 2011Reviewed: August 17th 2011Published: February 1st 2012
DOI: 10.5772/31471
Downloaded: 2156
© 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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