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Authors
Liu, Yan-Yun
Yang, Xu-Heng
Song, Ren-Jie
Luo, Shenglian
Li, Jin-Heng
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Article History
Received: 16 October 2016
Accepted: 26 January 2017
First Online: 10 April 2017
Competing interests
: The authors declare no competing financial interests.
