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Authors
Peng, Yandong
Yang, Aihong
Xu, Yan
Wang, Peng
Yu, Yang
Guo, Hongju
Ren, Tingqi
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Article History
Received: 25 May 2016
Accepted: 7 November 2016
First Online: 13 December 2016
Competing interests
: The authors declare no competing financial interests.
