PMC:7780429 / 4085-4246 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":"asks, they must be highly effective, with type FFP2 (filtering face pieces) (in Europe), N95 (USA) and KN95 (China) recommended.6 There are other types of masks ","tracks":[]}