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Authors
Bai, Y
Shang, Q
Zhao, H
Pan, Z
Guo, C
Zhang, L
Wang, Q
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Article History
Received: 9 February 2016
Revised: 23 February 2016
Accepted: 3 March 2016
First Online: 31 March 2016
Competing interests
: The authors declare no conflict of interest.
