Funding for this research was provided by:
Special Innovation Projects Foundation of the Higher Education Institutions of Guangdong Province, China (2018KTSCX073, 2017KTSCX082 &)
Key projects of social science and technology development in Dongguan (202050715027177)
Public Health and Preventive Medicine Discipline Development Funds of Guangdong Medical University in 2020 (4SG20004G)
Received: 22 September 2020
Accepted: 9 March 2021
First Online: 1 April 2021
: This study was approved by the Ethics Committee of the Affiliated Hospital of Guangdong Medical University (Permit Number: PJ2015034KT).
: Not applicable. Manuscript is approved by all authors for publication.
: The authors declare that they have no competing interests.