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Authors
Shi, Yongyan
Liu, Tianjing
Zhao, Xinyi
Yao, Li
Hou, Ana
Fu, Jianhua
Xue, Xindong
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Article History
Received: 3 October 2017
Accepted: 18 December 2017
First Online: 24 January 2018
Competing interests
: The authors declare no conflict of interest.
Free to read: This content has been made available to all.
