Received: 24 March 2020
Accepted: 19 August 2020
First Online: 27 August 2020
Ethics approval and consent to participate
: This study was conducted in accordance with the ethical standards put forth in the Declaration of Helsinki. An online written informed consent was obtained from the participates via the Questionnaire Star before they were able to continue to the survey. The study was approved by the Ethics Committee of West China Hospital, Sichuan University (Reference number 2020–178).
: The participants received a complete description of this survey and provided online written informed consent. A copy of the written consent is available for review by the editor of this journal.
: The authors declare that they have no competing interests.