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Authors
Cai, Anping
Wang, Ling
Zhou, Yingling
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Article History
Received: 8 October 2015
Revised: 5 December 2015
Accepted: 24 December 2015
First Online: 18 February 2016
Competing interests
: The authors declare no conflict of interest.
Free to read: This content has been made available to all.
