Respiratory filters in clinical practice.
D000391:Air Microbiology; D003428:Cross Infection / Q000517:prevention & control; D005374:Filtration / Q000295:instrumentation*; D006801:Humans; D066298:In Vitro Techniques; D008131:London; D008722:Methods; D012124:Respiratory Care Units / Q000295:instrumentation*; D013242:Sterilization; D012122:Ventilators, Mechanical / Q000295:instrumentation*; D014871:Water Microbiology