Methods:2 590 pregnant women are examined about their age,medical records,serology and ultrasound,at the same time prenatal diagnosis and chromosomal karyotype s analysis were conducted.

 
  • 方法:对2590名孕妇的年龄及病史、血清学、超声的联合筛查,并行产前诊断及染色体核型分析。
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