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Authors
Li, Lei
Bi, Huiting
Gai, Shili
He, Fei
Gao, Peng
Dai, Yunlu
Zhang, Xitian
Yang, Dan
Zhang, Milin
Yang, Piaoping
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Article History
Received: 15 September 2016
Accepted: 19 January 2017
First Online: 21 February 2017
Competing interests
: The authors declare no competing financial interests.
