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Authors
Ren, Kewei
Liu, Ying
Wu, Jie
Zhang, Yue
Zhu, Jing
Yang, Min
Ju, Huangxian
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Article History
Received: 29 January 2016
Accepted: 17 October 2016
First Online: 24 November 2016
Competing interests
: The authors declare no competing financial interests.
