Open access peer-reviewed chapter
By Renata Soares, Elisabete Pires, André M. Almeida, Romana Santos, Ricardo Gomes, Kamila Koči, Catarina Ferraz Franco and Ana Varela Coelho
Submitted: March 24th 2011Reviewed: October 16th 2011Published: February 29th 2012
DOI: 10.5772/30938
Downloaded: 7358
© 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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