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Acknowledgements
The authors acknowledge the financial support by the National Natural
Science Foundation of China (Grant No. 61106056), the Ministry of
Science and Technology of China (863 Project, No. SS2013AA050303),
the Scientific Research Foundation for Returned Scholars, the Ministry of
Education of China and the Fundamental Research Funds for the Central
Universities (Hust, 2011TS020), and the Nature Science Foundation of
Hubei Province (2008CDA042).
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