Time to Upgrade from Cloth and Surgical Masks to Respirators? Your Questions Answered
Leyla Asadi, MD, C Raina MacIntyre, MBBS, FRACP, FAFPHM, M App Epid, PhD, Lisa M Brosseau, ScD, CIH, Trish Greenhalgh, OBE, FRCP, FRCGP, FMedSci
Many countries are rethinking their COVID-19 mask advice