Various approaches for the improvement of hearing.
D002648:Child; D002675:Child, Preschool; D003054:Cochlear Implants; D003638:Deafness / Q000175:diagnosis / Q000534:rehabilitation* / Q000601:surgery; D006310:Hearing Aids; D006801:Humans; D007223:Infant; D014433:Tympanoplasty / Q000379:methods