Funding for this research was provided by:
National Key Research and Development Program of China (2018YFC0831002)
Article History
Accepted: 16 June 2021
First Online: 25 June 2021
Declarations
:
: The study has been approved by ethic committee of China University of Politic Science and Law and all procedures were in accordance with the Declaration of Helsinki.
: The subjects all participated voluntarily and signed the informed consent form, they were given daily necessities as compensation after the study.
: Written informed consent for publication was obtained from all participants.
: All authors declare that they have no conflicts of interest.