Open access peer-reviewed chapter
By Roberta Zappacosta, Barbara Zappacosta, Serena Capanna, Chiara D'Angelo, Daniela Gatta and Sandra Rosini
Submitted: April 26th 2011Reviewed: September 15th 2011Published: April 27th 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.
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