Hearing in ethnically different longshoremen.
D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D004781:Environmental Exposure; D006311:Hearing Disorders / Q000175:diagnosis / Q000208:ethnology* / Q000209:etiology; D006320:Hearing Tests; D006801:Humans; D008297:Male; D008875:Middle Aged; D009784:Occupational Diseases / Q000175:diagnosis / Q000208:ethnology* / Q000209:etiology