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Authors
Chang, Lei
Gu, Yifei
Yu, Zhang
Ying, Hanru
Qiu, Yajing
Ma, Gang
Chen, Hui
Jin, Yunbo
Lin, Xiaoxi
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Article History
Received: 13 October 2016
Accepted: 23 January 2017
First Online: 22 February 2017
Competing interests
: The authors declare no competing financial interests.
