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Authors
Luo, Hong
Wang, Jing
Qiao, Chenhui
Ma, Ning
Liu, Donghai
Zhang, Weihua
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Article History
Received: 30 March 2015
Revised: 10 June 2015
Accepted: 16 June 2015
First Online: 23 October 2015
Competing interests
: The authors declare no conflict of interest.
