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Authors
Cheng, Jianxin
Sun, Xianqiang
Li, Weihua
Liu, Guixia
Tu, Yaoquan
Tang, Yun
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Article History
Received: 16 March 2015
Accepted: 30 November 2015
First Online: 8 January 2016
Competing interests
: The authors declare no competing financial interests.
