[Clinical observations on perceptive deafness of unknown etiology].
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001299:Audiometry; D001307:Auditory Perception; D002648:Child; D002675:Child, Preschool; D005260:Female; D006311:Hearing Disorders; D006801:Humans; D008297:Male