Funding for this research was provided by:
Young Scientists Fund (41901179)
Postdoctoral Research Foundation of China (2018M640171)
Science and Technology Project of Beautiful China Ecological Civilization Construction (XDA23100403)
Direct Grant scheme of Lingnan University, Hong Kong (DR182B)
Received: 12 April 2021
Accepted: 28 August 2021
First Online: 15 September 2021
: This is an analysis of secondary data so ethics approval is not required.
: Not applicable.
: The authors declare that they have no competing interests.