Funding for this research was provided by:
China Postdoctoral Science Foundation (2019M662101)
Zhejiang University Zijin Talent Program
Received: 27 March 2020
Accepted: 28 August 2020
First Online: 7 September 2020
Ethics approval and consent to participate
: This study was reviewed and approved by the Institutional Review Board of the School of Public Health, Zhejiang University (reference number: ZGL201706–2). All participants signed the consent form, and were informed that their participation was voluntary, anonymous, and they could quit at any time.
: Not applicable.
: The authors declare that they have no competing interests.