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In [ 1], authorship information was mistakenly left out of the Acknowledgments section.
The correct Acknowledgments section is: This work was supported by Singapore MOE AcRF Grant No: MOE2008-T2-1-074. Stephanus D. Handoko and X. Ouyang contributed equally to this work.
We apologize for the error.

For information on obtaining reprints of this article, please send e-mail to: tcbb@computer.org.

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