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Authors
Jing, Pengtao
Ji, Wenyu
Zeng, Qinghui
Li, Di
Qu, Songnan
Wang, Jia
Zhang, Dandan
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Article History
Received: 18 February 2015
Accepted: 30 June 2015
First Online: 22 July 2015
Competing interests
: The authors declare no competing financial interests.
