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Authors
Hu, Jiaming
Sheng, Yan
Kwak, Kwang Joo
Shi, Junfeng
Yu, Bohao
Lee, L. James
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Article History
Received: 14 October 2016
Accepted: 26 October 2017
First Online: 22 November 2017
Competing interests
: The authors declare no competing financial interests.
