title: Language development and non-verbal skills in severely mentally retarded children: an epidemiological study.
mesh_terms: D000293:Adolescent; D002648:Child; D002653:Child Behavior Disorders / Q000150:complications; D002657:Child Development; D002675:Child, Preschool; D006233:Persons with Disabilities; D005149:Facial Expression; D005260:Female; D005868:Gestures; D006311:Hearing Disorders / Q000150:complications; D006801:Humans; D008607:Intellectual Disability / Q000150:complications* / Q000209:etiology; D007360:Intelligence; D007361:Intelligence Tests; D007804:Language Development; D008134:Long-Term Care; D008297:Male; D009048:Motor Skills; D011581:Psychological Tests; D012744:Sex Ratio; D014786:Vision Disorders / Q000150:complications