Article History
Received: 14 March 2020
Accepted: 22 April 2020
First Online: 9 May 2020
Compliance with ethical standards
:
: No potential competing interests.
: I solemnly declare that the research paper submitted is the result of my independent research work. Except for the quoted contents, this paper does not include any other work achievements that have been published or written by individuals or groups. Individuals and collectives who have made important contributions to the study of this paper have been clearly identified in this paper. I am fully aware that I am obligated to undertake the legal consequence of the statement.
: The author is fully aware of the provisions of your journal on the retention and use of papers. I agree to authorize the journal, which collects the research paper in the academic paper collection after digitization, reproduction and other value-added processes, and provides any third party to browse, download, quote, transmit, print, etc. through the network or other public communication methods in electronic form.
: Please contact corresponding author for data requests.