Funding for this research was provided by:
bill and melinda gates foundation (INV-006277)
national natural science foundation of china (82073612)
science and technology commission of shanghai municipality (20dz1200600)
Shanghai Municipal Health Commission (GWV-10.1-XK16)
Article History
Received: 24 June 2021
Accepted: 2 November 2021
First Online: 7 December 2021
Declarations
:
: Waiver of informed consent for collection of epidemiological data from patients with COVID-19 was granted by the Health Commission of Hebei Province as part of the infectious disease outbreak investigation.
: Not applicable.
: The authors declare that they have no competing interests.