Funding for this research was provided by:
National Social Science Grant of China (No. 13CSH076)
Shanghai Public Health Key Discipline Plan (Nos. 12GWZX0901, 15GWZK1001)
Received: 19 July 2020
Accepted: 7 January 2021
First Online: 22 January 2021
Ethics approval and consent to participate
: The study was approved by the Medical Research Ethics Committee of the School of Public Health, Fudan University (The international registry NO. IRB00002408 & FWA00002399). A written informed consent was obtained from each participant.
: Not applicable.
: The authors have no conflicts of interest to disclose.