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Authors
Tu, Wenkang
Wang, Yunxi
Li, Xin
Zhang, Peng
Tian, Yongjun
Jin, Shaohua
Wang, Li-Min
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Article History
Received: 10 October 2014
Accepted: 22 January 2015
First Online: 17 February 2015
Competing interests
: The authors declare no competing financial interests.
