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Authors
Li, Kun
Wang, Xu-de
Yang, Shan-shan
Gu, Jing
Deng, Jiao-yu
Zhang, Xian-En
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Article History
Received: 2 June 2016
Revised: 19 November 2016
Accepted: 1 December 2016
First Online: 11 January 2017
Competing interests
: The authors declare no conflict of interest.
Free to read: This content has been made available to all.
