孕早期胎儿颈部透明层厚度和鼻骨长度联合检测筛查唐氏综合征的临床价值
잉조기태인경부투명층후도화비골장도연합검측사사당씨종합정적림상개치
Measurements of fetal nuchal translucency and nasal bone in first-trimester screening for Down syndrome
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