Funding for this research was provided by:
Fundamental Research Funds for the Central Universities (2018NTSS36)
Received: 15 May 2020
Accepted: 2 July 2020
First Online: 9 July 2020
Ethics approval and consent to participate
: The article type of this paper is “opinion”, and therefore does not have a requirement for ethics approval.
: Not applicable.
: The authors declare that they have no competing interests.