TY  - RPRT
TI  - Antenatal screening for Down syndrome.
AU  - N Wald
AU  - H Cuckle
AU  - P Royston
PY  - 1988
DO  - 10.1016/s0140-6736(88)90891-4
UR  - https://pubmed.ncbi.nlm.nih.gov/2904069/
ID  - 2904069
ER  -