Article History
Accepted: 21 June 2021
First Online: 22 July 2021
Declarations
:
: This research was supported by the National Natural Science Foundation of China (Grant 72002214) and the fund for building world-class universities (disciplines) of Renmin University of China (Project No. KYGJD2021003) awarded to Xin Liu.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all participants in the study.
: The authors declare that they have no conflict of interest.