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The fit of a mask is as important as its filtration ability, experts say. So is avoiding the many counterfeits.

United statesNew jerseySouth koreaSouth koreanBrian wolinTom friedenSricharan chalikondaMegan ranneyDevabhaktuni srikrishnaNational institute for occupational safetyCenters for diseaseNational centerPowecom office depotDrug administrationOffice depotJournal of the american college surgeons