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Authors
Pei, Songfeng
Wei, Qinwei
Huang, Kun
Cheng, Hui-Ming https://orcid.org/0000-0002-5387-4241
Ren, Wencai https://orcid.org/0000-0003-4997-8870
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Article History
Received: 2 August 2017
Accepted: 4 December 2017
First Online: 10 January 2018
Competing interests
: The authors declare no competing financial interests.
