TY  - RPRT
TI  - Established markers in second trimester maternal serum.
AU  - H Cuckle
PY  - 1996
DO  - 10.1016/s0378-3782(96)01814-2
UR  - https://pubmed.ncbi.nlm.nih.gov/9031835/
ID  - 9031835
ER  -