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Authors
Zhang, Jie
He, Fan
Zhang, Wen
Zhang, Meng
Yang, Huilin
Luo, Zong-Ping
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Article History
Received: 14 June 2014
Revised: 24 August 2014
Accepted: 25 October 2014
First Online: 20 January 2015
Competing interests
: The authors declare no conflict of interest.
