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Authors
Ren, Weihong
Liu, Yan
Wang, Xuerui
Jia, Lixin
Piao, Chunmei
Lan, Feng
Du, Jie
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Article History
Received: 16 January 2016
Accepted: 1 June 2016
First Online: 22 June 2016
Competing interests
: The authors declare no competing financial interests.
