彩色多普勒超声产前诊断胎儿永久性右位脐静脉和单脐动脉的价值
채색다보륵초성산전진단태인영구성우위제정맥화단제동맥적개치
Application value of color Doppler ultrasonography in the diagnosis of persistent right umbilical vein and single umbilical artery
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