PMC:7780429 / 16743-16848 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/7780429","sourcedb":"PMC","sourceid":"7780429","source_url":"https://www.ncbi.nlm.nih.gov/pmc/7780429","text":"ciated with the use of a filter mask (FFP2 or KN95), OR 2.14 (95% CI 1.07 to 4.32); being a health worker","tracks":[]}