@misc{indiciaecee0accc61af,
  title = {Second trimester screening for trisomy 21.},
  author = {R Osathanondh and J A Canick and K B Abell and L D Stevens and G E Palomaki and G J Knight and J E Haddow},
  year = {1989},
  doi = {10.1016/s0140-6736(89)90299-7},
  url = {https://pubmed.ncbi.nlm.nih.gov/2567830/},
  note = {Source identifier: 2567830}
}