Received: 16 June 2021
Accepted: 27 January 2022
First Online: 6 June 2022
: The Peking University Biomedical Ethics Review Committee provides ethical approval of the survey (approval number: IRB00001052-14010). Respondents are given a statement explaining the purpose of the study, and all study participants had signed written informed consent prior to being investigated. The study protocol is performed in accordance with the relevant guidelines.
: Not applicable
: The authors declare that they have no competing interests.