SEX CHROMOSOME ABNORMALITIES IN A POPULATION OF  1,662 MENTAL DEFECTIVES.
D002869:Chromosome Aberrations; D025063:Chromosome Disorders; D006801:Humans; D008607:Intellectual Disability; D012728:Sex Chromatin; D012729:Sex Chromosome Aberrations; D013019:South Africa; D013223:Statistics as Topic
CHROMOSOME ABNORMALITIES; MENTAL RETARDATION; SEX CHROMATIN; SOUTH AFRICA; STATISTICS