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Authors
Yang, Yanling
Zhao, Bing
Zhang, Ziyu
Bai, Chunxu
Xu, Xiaoguang
Jiang, Yong
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Article History
Received: 22 April 2016
Accepted: 14 June 2016
First Online: 8 July 2016
Competing interests
: The authors declare no competing financial interests.
