title: Etiological factors in mental retardation: a study of 470 cases.
mesh_terms: D000293:Adolescent; D001720:Birth Injuries / Q000150:complications; D001724:Birth Weight; D002648:Child; D003241:Consanguinity; D004660:Encephalitis / Q000150:complications; D006801:Humans; D000860:Hypoxia / Q000150:complications; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases / Q000150:complications; D007234:Infant, Premature; D008607:Intellectual Disability / Q000209:etiology* / Q000235:genetics; D008581:Meningitis / Q000150:complications