胎儿静脉导管及颈项透明层厚度的超声检测在先天性心脏畸形筛查中的价值
태인정맥도관급경항투명층후도적초성검측재선천성심장기형사사중적개치
Value of ultrasound detection of fetal venosus ductus and nuchal translucency in screening of congenital heart disease
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