Received: 27 February 2021
Accepted: 25 May 2021
First Online: 1 June 2021
: The study was approved by the China-Japan Friendship Hospital’s institutional review board. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. Written informed consent was not required, as questionnaire responses were anonymized, and the study carried less than minimal risk.
: Not applicable.
: The authors declare that they have no competing interests.