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Authors
Yao, D D
Yang, L
Wang, Y
Liu, C
Wei, Y J
Jia, X B
Yin, W
Shu, L
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Article History
Received: 29 August 2014
Revised: 17 March 2015
Accepted: 18 March 2015
First Online: 7 May 2015
Competing interests
: The authors declare no conflict of interest.
