Open access peer-reviewed chapter
By Soen Eng Yap and Babill Stray-Pedersen
Submitted: April 5th 2011Reviewed: September 22nd 2011Published: January 20th 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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