孕15~20+6周产前超声筛查联合孕妇血清学筛查提高胎儿染色体异常检出率的临床研究
잉15~20+6주산전초성사사연합잉부혈청학사사제고태인염색체이상검출솔적림상연구
The clinical value of prenatal ultrasonography combined with maternal serology screening for chromosomal abnormality in 15 to 20+6 gestational weeks
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