Funding for this research was provided by:
National Natural Science Foundation of China (No.72071004, No.71601004)
National Key R&D Program of China (No.2020YFC2008805, No.2020YFC2008800)
Undergraduate Innovative Research Project (No. BJMU-HL-201808D)
Article History
Received: 13 October 2020
Accepted: 1 February 2022
First Online: 10 February 2022
Declarations
:
: The study was approved by Peking University Institutional Review Board and the number is IRB00001052–19047. The guiding words of the questionnaire filled in by the participants were as follows: filling in the questionnaire was regarded as informed consent. Therefore, the authors consider that written informed consent was obtained from the participants.
: Not applicable.
: The authors declare that they have no competing interests.