Received: 4 April 2020
Accepted: 7 November 2020
First Online: 19 November 2020
Ethics approval and consent to participate
: This study received ethical approval from the Committee on Human Ethics of Dalian Medical University and all research processes met ethical standards (No. 2019–11). Written informed content was obtained from the patients prior to the survey.
: Not applicable.
: The authors declare that they have no competing interests.