Funding for this research was provided by:
the basic public welfare project of Zhejiang Province (LGF19H260012)
WeiJiang Special Foundation, Zhejiang University School of Public Health (20190701)
Received: 9 November 2020
Accepted: 8 April 2021
First Online: 17 April 2021
: All participants provided written informed consent before participation. The study was approved by the institutional review board at the School of Public Health, Zhejiang University (No: ZGL201909–10).
: Not applicable.
: The authors declare no conflict of interest.