TY  - RPRT
TI  - First-trimester Down syndrome screening: component analytes and timing for optimal performance.
AU  - Katharine D Wenstrom
PY  - 2005
DO  - 10.1053/j.semperi.2005.06.002
UR  - https://pubmed.ncbi.nlm.nih.gov/16104668/
ID  - 16104668
ER  -