title: FM systems.
authors: D E
authors: DE
authors: Lewis
mesh_terms: D000161:Acoustic Stimulation; D000669:Amplifiers, Electronic; D001309:Auditory Threshold; D002648:Child; D002675:Child, Preschool; D004423:Ear / Q000503:physiopathology; D004867:Equipment Design; D005260:Female; D006310:Hearing Aids; D006312:Hearing Loss, Bilateral / Q000503:physiopathology / Q000534:rehabilitation*; D006801:Humans; D008297:Male; D009622:Noise; D013061:Speech Acoustics; D013067:Speech Perception