Funding for this research was provided by:
National Natural Science Foundation of China (21865026)
Xinjiang Production and Construction Corps (2018BC005)
Hebei key research and development project (18273401D)
Hebei Province's Innovation Capacity Improvement Project (18952814D)
Received: 7 October 2019
Accepted: 20 December 2019
First Online: 3 January 2020
Ethics approval and consent to participate
: Not applicable.
: All authors agree to publish.
: The authors declare that they have no competing interests.