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Authors
Sun, Han
Wang, Xiangping
Fan, Yanwen
Liu, Chao
Wu, Peng
Li, Qiaoyan
Yin, Weilun
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Article History
Received: 22 September 2016
Accepted: 27 January 2017
First Online: 7 March 2017
Competing interests
: The authors declare no competing financial interests.
