Open access
Submitted: April 18th, 2011 Published: April 5th, 2012
DOI: 10.5772/33296
From the Edited Volume
Edited by Josette Bettany-Saltikov and Berta Paz-Lourido
Submitted: April 18th, 2011 Published: April 5th, 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.