TY  - RPRT
TI  - First-trimester sonographic screening for Down syndrome.
AU  - Fergal D Malone
AU  - Mary E D'Alton
AU  - Society for Maternal-Fetal Medicine
PY  - 2003
DO  - 10.1016/j.obstetgynecol.2003.08.004
UR  - https://pubmed.ncbi.nlm.nih.gov/14672489/
ID  - 14672489
ER  -