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3ply face masks, FFP2, FFP3, KN95 masks are professional. We register an Medical license in March of 2020.

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A cluster randomized clinical trial comparing fit-tested

Background:We compared the efficacy of medical masks, N95 respirators (fit tested and non fit tested), in health care workers (HCWs). Methods:A cluster randomized clinical trial (RCT) of 1441 HCWs in 15 Beijing hospitals was performed during the 2008/2009 winter. Participants wore masks or respirators during the entire work shift for 4 weeks. Best Offer FFP2 N95 KN95 Medische Masker Anti-Fog Feb 25, 2020 · Coupon FFP2 N95 KN95 Medische Masker Anti-Fog PM2.5 Wegwerp Half Gezichtsmasker Coupon 10pcs FFP2 N95 KN95 medical Mask Anti-fog PM2.5 Dis

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