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Authors
Xia, Gui-yang
Sun, De-juan
Ma, Jiang-hao
Liu, Yue
Zhao, Feng
Owusu Donkor, Paul
Ding, Li-qin
Chen, Li-xia
Qiu, Feng
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Article History
Received: 21 October 2016
Accepted: 25 January 2017
First Online: 8 March 2017
Competing interests
: The authors declare no competing financial interests.
