Funding for this research was provided by:
Research funds to YB from the University of Macau (MYRG2015–00190-ICMS-QRCM, MYRG106 (Y1-L3)-ICMS13-BY)
Received: 20 May 2020
Accepted: 20 October 2020
First Online: 25 October 2020
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of the School of Public Health and Management, Ningxia Medical University (No.2010–103). Written informed consent was obtained from all participants prior to questionnaire administration.
: Not applicable.
: The authors declare that they have no competing interests.