@misc{indiciae2196c90b0477,
  title = {Sequential and contingent prenatal screening for Down syndrome.},
  author = {Nicholas J Wald and Alicja R Rudnicka and Jonathan P Bestwick},
  year = {2006},
  doi = {10.1002/pd.1498},
  url = {https://pubmed.ncbi.nlm.nih.gov/16821246/},
  note = {Source identifier: 16821246}
}