Funding for this research was provided by:
National Natural Science Foundation of China (71804197)
China Scholarship Council
Article History
Received: 8 June 2020
Accepted: 5 April 2021
First Online: 13 April 2021
Declarations
:
: Ethical approval was obtained from the Institutional Review Committee of the Xiangya School of Public Health of Central South University (XYGW-2019-029). 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.
: Not applicable.
: The authors declare that they have no competing interests.