Chromosome Detection Results and Related Factors in Second-trimester Fetuses with Nasal Bone Abnormalities 
HOU Dongxia,HOU Liqing,WUYUNTANA,JI Yunpeng,WANG Xiaohua,JI Xiaoping
Chinese General Practice . 2021, (6): 696 -700 .  DOI: 10.12114/j.issn.1007-9572.2020.00.605