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Authors
Xu, H.
Li, Zhichao
He, Feng
Wang, X.
Atia-Tul-Noor, A.
Kielpinski, D.
Sang, R. T.
Litvinyuk, I. V.
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Article History
Received: 21 November 2016
Accepted: 8 May 2017
First Online: 16 June 2017
Competing interests
: The authors declare no competing financial interests.
