@misc{indiciae102370a1bb68,
  title = {Maternal age and placenta previa: a population-based, case-control study.},
  author = {J Zhang and D A Savitz},
  year = {1993},
  doi = {10.1016/0002-9378(93)90511-g},
  url = {https://pubmed.ncbi.nlm.nih.gov/8438945/},
  note = {Source identifier: 8438945}
}