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J. Li et al.
ACKNOWLEDGMENTS
We gratefully acknowledge financial support from the State Key Program of
Basic Research of China (Grant 2002CB512802, 2005BA711A01), the
National Natural Science Foundation of China (Grants 30672539,
20572117, and 20472094), and the 863 Hi-Tech Program (Grants
2006AA020402 and 2006AA020602).
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