Experts discuss merits of surgical masks.
D000416:Alberta; D005060:Europe; D006801:Humans; D017053:Infection Control / Q000379:methods* / Q000592:standards; D016365:Liability, Legal; D008397:Masks / Q000592:standards / Q000706:statistics & numerical data*; D016273:Occupational Exposure / Q000517:prevention & control; D009873:Operating Rooms / Q000592:standards*; D014481:United States