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Authors
Wang, Cheng
Li, Zhaoyi
Kim, Myoung-Hwan
Xiong, Xiao
Ren, Xi-Feng
Guo, Guang-Can
Yu, Nanfang
Lončar, Marko
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Article History
Received: 23 July 2017
Accepted: 11 November 2017
First Online: 13 December 2017
Competing interests
: The authors declare no competing financial interests.
