Funding for this research was provided by:
Guangdong Medical Research Foundation (C2015033)
Received: 1 March 2020
Accepted: 15 October 2020
First Online: 24 October 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committees of the Guangzhou Medical University (IORG No: IORG20150416). In this face-to-face survey study, all study participants were informed of the purpose of the study and had the right to leave the interview at any time. All study participants were required to give written informed consent before the interview.
: Not applicable.
: The authors have declared that no competing interests exist.