Open access
Submitted: 23 May 2012 Published: 29 May 2013
DOI: 10.5772/55221
From the Edited Volume
Edited by Ana Varela Coelho and Catarina de Matos Ferraz Franco
Submitted: 23 May 2012 Published: 29 May 2013
© 2013 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.