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Lei, Linghua

Chen, Yanhua

Ou, Lijun

Xu, Yinglong

Yu, Xiaoying

Funding for this research was provided by:

Science and Technology Project of Hunan Province (2011NK3046 and 2012FJ4292)

Open Fund Project of Hunan province University Innovation platform (12K131)

Hunan Provincial Natural Science Foundation of China (12JJ6025)

Priority Development Discipline of Hunan Province (2011042)