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Authors
Liang, Qing
Cheng, Ni
Zhang, Gufang
Liang, Yurong
Qian, Feng
Wu, Dianqing
Ye, Richard D.
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Article History
Received: 18 December 2015
Accepted: 13 April 2016
First Online: 13 May 2016
Competing interests
: The authors declare no competing financial interests.
