@misc{indiciae2f23a40a0e41,
  title = {Down syndrome and maternal age.},
  author = {R E Christianson},
  year = {1976},
  doi = {10.1016/s0140-6736(76)91710-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/63020/},
  note = {Source identifier: 63020}
}