@misc{indiciaeee843e013198,
  title = {Cervical pregnancy.},
  author = {C Petterson and D Chan},
  year = {1983},
  doi = {10.5694/j.1326-5377.1983.tb136198.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/6843446/},
  note = {Source identifier: 6843446}
}