title: Fit testing: questions and answers.
authors.affiliation: National Institute for Occupational Safety and Health National Occupational Research Agenda, USA.
authors.forename: Lee
authors.initials: L
authors.lastname: Hager
authors.forename: Pegeen
authors.initials: P
authors.lastname: Smith
mesh_terms: D004430:Ear Protective Devices / Q000592:standards*; D006801:Humans; D007318:Inservice Training / Q000379:methods / Q000592:standards; D009623:Noise, Occupational / Q000517:prevention & control*; D016273:Occupational Exposure / Q000517:prevention & control*