Open access peer-reviewed chapter
By Abdo R. Jurjus, Inaya Abdallah Hajj Hussein and Alice A. Gerges
Submitted: April 19th 2011Reviewed: September 8th 2011Published: March 21st 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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