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Authors
Sun, Wei
Liu, Ji-Yuan
Gong, Xue-Qing
Zaman, Waqas-Qamar
Cao, Li-Mei
Yang, Ji
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Article History
Received: 5 August 2016
Accepted: 9 November 2016
First Online: 2 December 2016
Competing interests
: The authors declare no competing financial interests.
