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Authors
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Funding
Funding for this research was provided by:
National Research Foundation of Korea (2017R1C1B2005266, 2018R1A5A7025409)
Transportation & Logistics Research Program (17TLRP-C135446-01)
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Article History
Received: 30 July 2019
Revised: 19 September 2019
Accepted: 14 October 2019
First Online: 21 December 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
