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Acknowledgments
This work was partially supported by grants from the Natural Science Foundation of China (grant number 8214100646). The information used in was collected from the US CDC website. The use of the material, including any links to the materials on the CDC website, does not imply endorsement by the CDC or the United States Government of work presented in this commentary. The material is otherwise available on the agency website for no charge.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Additional information
Funding
This work was supported by National Natural Science Foundation of China [Grant Number 8214100646].