TY  - RPRT
TI  - Down syndrome screening in multiple pregnancies.
AU  - Alexandra Matias
AU  - Nuno Montenegro
AU  - Isaac Blickstein
PY  - 2005
DO  - 10.1016/j.ogc.2004.10.001
UR  - https://pubmed.ncbi.nlm.nih.gov/15644291/
ID  - 15644291
ER  -