Open access peer-reviewed chapter
By Hitomi Ohta, Kenji Akita and Tsunetaka Ohta
Submitted: May 6th 2011Reviewed: November 24th 2011Published: May 2nd 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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