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Authors
Liu, Qihan
Nian, Guodong https://orcid.org/0000-0001-7005-634X
Yang, Canhui
Qu, Shaoxing https://orcid.org/0000-0002-1217-4644
Suo, Zhigang https://orcid.org/0000-0002-4068-4844
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Article History
Received: 15 January 2018
Accepted: 1 February 2018
First Online: 27 February 2018
Competing interests
: The authors declare no competing interests.
