TY  - GEN
AU  - Merz,E
TI  - Risk calculation of fetal chromosomal defects in the first trimester
SN  - 0172-4614
PY  - 2006///0123
KW  - Congenital Abnormalities
KW  - diagnostic imaging
KW  - Female
KW  - Humans
KW  - Pregnancy
KW  - Pregnancy Trimester, First
KW  - Risk Factors
KW  - Ultrasonography
N1  - Publication Type: Editorial
ER  -