title: The contribution of constitutional chromosomal abnormalities to mental deficiency.
mesh_terms: D004314:Down Syndrome / Q000235:genetics*; D006801:Humans; D007231:Infant, Newborn; D008607:Intellectual Disability / Q000235:genetics*; D007713:Klinefelter Syndrome / Q000150:complications* / Q000235:genetics; D014424:Turner Syndrome / Q000150:complications* / Q000235:genetics