Wang, Huibing
Li, Haohao
Fu, Xianping
Article History
Received: 3 January 2019
Revised: 20 April 2019
Accepted: 15 May 2019
First Online: 25 May 2019
Compliance with Ethical Standards
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: This study was funded by the National Natural Science Foundation of China Grant 61370142 and Grant 61272368, by the Fundamental Research Funds for the Central Universities Grant 3132016352, by the Fundamental Research of Ministry of Transport of P.R. China Grant 2015329225300. Huibing Wang, Haohao Li and Xianping Fu declare that they have no conflict of interest. Both Huibing Wang and Haohao Li contribute equally to this paper. This article does not contain any studies with human participants or animals performed by any of the authors.