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First trimester spontaneous abortions occur in 15 to 20% of all clinically recognized pregnancies. Chromosomal -anomalies are responsible for more than 50% of spontaneous abortions. The majority (90%) of these chromosomal anomalies are numerical, particularly autosomal trisomies (involving chromosomes 13,16, 18, 21, 22), polyploidy and monosomy X. At birth(More)
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