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Authors
Liang, Yizhi
Jin, Long
Wang, Lidai
Bai, Xue
Cheng, Linghao
Guan, Bai-Ou
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Article History
Received: 23 August 2016
Accepted: 12 December 2016
First Online: 18 January 2017
Competing interests
: The authors declare no competing financial interests.
