Funding for this research was provided by:
the Graduate Student's Research and Innovation Fund of Heibei Province Department of Education in China (CXZZBS2018082)
the 2013 Chinese People’s Liberation Army Logistics Research Project (BBJ13C001)
Article History
Received: 5 June 2019
Accepted: 10 October 2019
First Online: 20 October 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.