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Authors
Zhao, X
Sun, G
Sun, X
Tian, D
Liu, K
Liu, T
Cong, M
Xu, H
Li, X
Shi, W
Tian, Y
Yao, J
Guo, H
Zhang, D
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Article History
Received: 19 January 2016
Revised: 7 March 2016
Accepted: 9 March 2016
First Online: 14 April 2016
Competing interests
: The authors declare no conflict of interest.
