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Second-trimester maternal serum free-β-human chorionic gonadotropin and α-fetoprotein levels in normal twin and singleton pregnancies: a report of local Chinese population |
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| Authors: | Zhenwei Xie Shiming Lu Yuning Zhu Yali Sun Yu Jin |
| Institution: | Women's Hospital, School of Medicine, Zhejiang University, Hangzhou, China |
| Abstract: | |
| Keywords: | maternal serum screening Down syndrome twin pregnancies free-β-human chorionic gonadotropin α-fetoprotein |