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Pregnancy
Gestational Age
Pregnancy, Multiple
Crown-Rump Length
First Pregnancy Trimester
Pregnancy Outcomes
Maternal Age
Predictive Value of Tests
Sensitivity and Specificity
Prospective Studies
Twins
Dizygotic Twins
Monozygotic Twins
Ultrasonography, Prenatal
Prenatal Diagnosis
Pregnancy Reduction, Multifetal
Chorion
Neck
Fetal Death
Spontaneous Abortion
Co-Publications
9
7
4
3
1
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