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Acknowledgments
The authors gratefully thank the financial supports of the NSFC
(Grant Nos. 51172224 and 51103145), Natural Science Foundation
of Zhejiang Province (grant No. LY12B02013), Foundation of Zhe-
jiang Education Committee (Y201119787) and the Science and
Technology Developing Project of Jilin Province (Grant Nos.
20100533 and 201201009)
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Appendix A. Supplementary material
Supplementary data associated with this article can be found, in
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