PMC:7796291 / 13658-13798 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/7796291","sourcedb":"PMC","sourceid":"7796291","source_url":"https://www.ncbi.nlm.nih.gov/pmc/7796291","text":"ents, both respirators showed very high filtration efficiency of ≥99.5%. It should be noted that the filtration efficiency was measured afte","tracks":[]}