Received: 2 February 2021
Accepted: 22 April 2021
First Online: 15 June 2021
: This study was approved by the Ethics Committee of Renmin Hospital of Wuhan University. It is an online survey. All participants sign an informed consent before filling in the questionnaire, and can withdraw from the survey at any time.
: Not applicable.
: The authors declare that they have no competing interests.