Funding for this research was provided by:
Natural Science Foundation of Shanxi Province (201801D12105)
Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province (2017006)
Shanxi Scholarship Council of China (2017-086)
Article History
Received: 29 February 2020
Revised: 23 April 2020
Accepted: 8 July 2020
First Online: 27 July 2020
Compliance with ethical standards
:
: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.