Open canal amplification.
D000328:Adult; D000368:Aged; D001299:Audiometry; D012048:Correction of Hearing Impairment; D005069:Evaluation Studies as Topic; D005260:Female; D005500:Follow-Up Studies; D006310:Hearing Aids / Q000295:instrumentation*; D006311:Hearing Disorders / Q000175:diagnosis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011145:Polyvinyls
D011145:Polyvinyls