title: Letter: Sex-chromosome abnormalities and social class.
mesh_terms: D000328:Adult; D002869:Chromosome Aberrations; D006801:Humans; D007231:Infant, Newborn; D007621:Karyotyping; D008297:Male; D012728:Sex Chromatin; D012730:Sex Chromosomes; D012923:Social Class; D012959:Socioeconomic Factors