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Authors
Yan, Biao
Hu, Zhaoyang
Yao, Wenqing
Le, Qiumin
Xu, Bo
Liu, Xing
Ma, Lan
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Article History
Received: 9 November 2016
Accepted: 6 December 2016
First Online: 11 January 2017
Competing interests
: The authors declare no competing financial interests.
