TY  - GEN
AU  - Spencer,Kevin
AU  - Kagan,Karl O
AU  - Nicolaides,Kypros H
TI  - Screening for trisomy 21 in twin pregnancies in the first trimester: an update of the impact of chorionicity on maternal serum markers
SN  - 0197-3851
PY  - 2008///0519
KW  - Chorion
KW  - Chorionic Gonadotropin, beta Subunit, Human
KW  - blood
KW  - Diseases in Twins
KW  - diagnosis
KW  - Down Syndrome
KW  - Female
KW  - Gestational Age
KW  - Humans
KW  - Nuchal Translucency Measurement
KW  - Pregnancy
KW  - Pregnancy Trimester, First
KW  - Pregnancy-Associated Plasma Protein-A
KW  - analysis
N1  - Publication Type: Comparative Study; Journal Article
UR  - https://doi.org/10.1002/pd.1923
ER  -