Funding for this research was provided by:
National Natural Science Foundation of China (71804009, 71603018, 91746116, 71972012, 71974011)
Special Fund for Joint Development Program of Beijing Municipal Commission of Education
Received: 8 July 2020
Accepted: 11 May 2021
First Online: 5 June 2021
: Written information was provided on the confidentiality and anonymity of the study as the cover of the questionnaire. After the participants gave their verbal consent, they began to fill out the questionnaire. We have got the ethical approval from the research ethics committee in the first affiliated hospital of Xiamen university (NO. KYX2016007; Affiliation: Xiamen University) for the whole process of this study.
: Not applicable.
: The authors declare that they have no competing interests.