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Authors
Qu, Qing
Zhang, Jian-Hua
Wang, Jing
Li, Qing-Yu
Xu, Chang-Wei
Lu, Xihong
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Article History
Received: 20 June 2016
Accepted: 22 December 2016
First Online: 30 January 2017
Competing interests
: The authors declare no competing financial interests.
