Funding for this research was provided by:
National Science Fund for Distinguished Young Scholars (81525023)
National Major Science and Technology Projects of China (2017ZX10103009-005, 2018ZX10201001-010, 2018ZX10713001-007)
National Institute for Health Research (no. 16/137/109)
Received: 23 September 2020
Accepted: 20 January 2021
First Online: 10 February 2021
Ethics approval and consent to participate
: All these data were in the public domain. All these are aggregated data, only presenting the numbers of cases or proportions/percentages, and thus are robustly anonymized data. Ethical review for the re-use of these secondary data is not required.
: Not applicable.
: H.Y. has received research funding from Sanofi Pasteur, GlaxoSmithKline, Yichang HEC Changjiang Pharmaceutical Company, and Shanghai Roche Pharmaceutical Company. M.A. has received research funding from Seqirus. None of those research funding is related to COVID-19. All other authors report no competing interests.