Hearing levels of aerospace workers...
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000401:Aircraft; D006317:Hearing Loss, Noise-Induced / Q000209:etiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009622:Noise; D009623:Noise, Occupational