TY  - RPRT
TI  - Repeat maternal serum testing in multiple marker Down's syndrome screening programmes.
AU  - H Cuckle
AU  - J Densem
AU  - N Wald
PY  - 1994
DO  - 10.1002/pd.1970140716
UR  - https://pubmed.ncbi.nlm.nih.gov/7526366/
ID  - 7526366
ER  -