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Authors
Yan, Pengfei
Zheng, Jianming
Gu, Meng
Xiao, Jie
Zhang, Ji-Guang http://orcid.org/0000-0001-7343-4609
Wang, Chong-Min
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Article History
Received: 21 June 2016
Accepted: 29 November 2016
First Online: 16 January 2017
Competing interests
: The authors declare no competing financial interests.
