Hearing studies of telephone operating personnel.
D000328:Adult; D000367:Age Factors; D001299:Audiometry; D001309:Auditory Threshold; D004781:Environmental Exposure; D005260:Female; D006309:Hearing; D006311:Hearing Disorders / Q000175:diagnosis; D006801:Humans; D008297:Male; D008875:Middle Aged; D009622:Noise; D009784:Occupational Diseases / Q000175:diagnosis; D009790:Occupations