PMC:7039910 / 17823-17997 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/7039910","sourcedb":"PMC","sourceid":"7039910","source_url":"https://www.ncbi.nlm.nih.gov/pmc/7039910","text":"er Spring Festival holidays may occur soon, especially in some densely populated cities25. Necessary strict measures should still be maintained even when the current measures","tracks":[]}