Article History
Received: 28 May 2020
Accepted: 17 November 2020
First Online: 25 November 2020
Ethics approval and consent to participate
: The study was approved by the institutional review board of the China-Japan Friendship Hospital and adhered to the Helsinki Declaration. Written informed consent was not required because the questionnaire was anonymous and characterized by a less-than-minimal risk of privacy invasion.
: Not applicable.
: The authors declare that they have no competing interests.