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Authors
Ning, Bo
Zhao, Wei
Qian, Chen
Liu, Pinghua
Li, Qingtian
Li, Wenyuan
Wang, Rong-Fu
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Article History
Received: 27 May 2016
Accepted: 20 June 2017
First Online: 24 August 2017
Competing interests
: The authors declare no competing financial interests.
