title: THE NONRANDOMNESS OF CHROMOSOMAL ABNORMALITIES. ASSOCIATION OF TRISOMY 18 AND DOWN'S SYNDROME.
mesh_terms: D000293:Adolescent; D002869:Chromosome Aberrations; D025063:Chromosome Disorders; D002887:Chromosomes, Human, Pair 18; D004314:Down Syndrome; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D013223:Statistics as Topic; D014314:Trisomy; D000073842:Trisomy 18 Syndrome
keywords: ADOLESCENCE; INFANT, NEWBORN; MONGOLISM; STATISTICS; TRISOMY