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Authors
Li, Yi
Wang, Meng
Gao, Yanxia
Yang, Wen
Xu, Qun
Eddleston, Michael
Li, Li
Yu, Xuezhong
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Article History
Received: 8 April 2015
Accepted: 26 October 2015
First Online: 25 November 2015
Competing interests
: The authors declare no competing financial interests.
