Open access peer-reviewed chapter
By David G. Newman and Robin Callister
Submitted: June 2nd 2011Reviewed: October 31st 2011Published: April 25th 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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