TY  - GEN
AU  - Breimer,L
TI  - First trimester biochemical screening for trisomy 21: the role of free beta-hCG and pregnancy associated plasma protein
SN  - 0004-5632
PY  - 1995///0720
KW  - Chorionic Gonadotropin
KW  - blood
KW  - Chorionic Gonadotropin, beta Subunit, Human
KW  - Down Syndrome
KW  - diagnosis
KW  - Female
KW  - Humans
KW  - Peptide Fragments
KW  - Pregnancy
KW  - Pregnancy Trimester, First
KW  - Pregnancy-Associated Plasma Protein-A
KW  - analysis
KW  - Prenatal Diagnosis
N1  - Publication Type: Comment; Letter
UR  - https://doi.org/10.1177/000456329503200223
ER  -