TY  - RPRT
TI  - [Comparison between age-dependent (Wald alpha program) and age-independent (Ulm index) analysis program for prenatal detection of Down's syndrome with serum markers].
AU  - C Zwahr
AU  - P Voss
AU  - G Kistner
UR  - https://pubmed.ncbi.nlm.nih.gov/9035827/
ID  - 9035827
ER  -