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Authors
Chen, Wenhong
Yan, Yurong
Zhang, Ye
Zhang, Xuemei
Yin, Yibing
Ding, Shijia
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Article History
Received: 26 February 2015
Accepted: 14 May 2015
First Online: 10 June 2015
Competing interests
: The authors declare no competing financial interests.
