Fit testing: questions and answers.
Hager
Lee
L
National Institute for Occupational Safety and Health National Occupational Research Agenda, USA.
Smith
Pegeen
P
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*