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Authors
Ni, Xiangyin
Yang, Wanqin
Tan, Bo
Li, Han
He, Jie
Xu, Liya
Wu, Fuzhong
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Article History
Received: 22 April 2015
Accepted: 17 December 2015
First Online: 21 January 2016
Competing interests
: The authors declare no competing financial interests.
