[Clinical studies on speech improvement of cleft palate patients by speech aid].
D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D002972:Cleft Palate / Q000150:complications; D006309:Hearing; D006801:Humans; D009305:Nasopharynx / Q000502:physiology; D013060:Speech; D013064:Speech Disorders / Q000209:etiology / Q000628:therapy*