Value of second trimester serological screening of Down syndrome in pregnant women with advanced age

Chunyan Liu(Cedars-Sinai Medical Center), Shanling Liu(Sichuan University), Daiwen Han(Sichuan University), Lixing Yuan(Sichuan University), Bin He, Qin Li(Hunan University), Yi Lai, Zhiying Liu(Tianjin University)
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