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Authors
Xu, Y. B.
Tang, Y. L.
Zhu, Y. L.
Liu, Y.
Li, S.
Zhang, S. R.
Ma, X. L.
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Article History
Received: 29 July 2016
Accepted: 20 September 2016
First Online: 11 October 2016
Competing interests
: The authors declare no competing financial interests.
