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Journal of International Obstetrics and Gynecology
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Screening for Trisomy 21 at 11—13+6 Weeks of Gestation
CHANG Ying;CHEN Xu;CUI Hong-yan;WANG Xiao-li;REN Chen-chun
Journal of International Obstetrics and Gynecology . 2012, (
1
): 75 -78 .