Funding for this research was provided by:
the National Nature Science Foundation of China (81571905)
the National Nature Science Foundation of China (81830064)
the National Nature Science Foundation of China (81721092)
the National Key Research Development Plan (2017YFC1103300)
Military Logistics Research Key Project (AWS17J005)
Article History
First Online: 14 June 2019
Compliance with Ethical Standards
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: The authors declare no potential conflicts of interest.