TY  - RPRT
TI  - Screening for Down syndrome.
AU  - R P Ager
AU  - R W Oliver
PY  - 1987
DO  - 10.1016/s0140-6736(87)92949-7
UR  - https://pubmed.ncbi.nlm.nih.gov/2442573/
ID  - 2442573
ER  -