Funding for this research was provided by:
project of the Harbin Medical University affiliated Second Hospital (KYBS2015-21)
Article History
Received: 10 November 2020
Accepted: 19 January 2021
First Online: 31 January 2021
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board (reference no.: KY2016–213). Before answering the questionnaire, participants were informed about the study and given the informed consent of each participant. Anonymity and confidentiality of the participants were guaranteed.
: The participants gave written consent to publication of the data.
: All the authors declare no conflicts of interest.